Interstate 90

{{Short description|Interstate Highway across northern United States}}

{{Infobox road

|country=USA

|type=I

|route=90

|map={{maplink|frame=yes|plain=yes|frame-align=center|frame-width=310|frame-height=240|type=line|from=Interstate 90.map}}

|map_custom=yes

|map_notes=Map of the contiguous United States with I-90 highlighted in red

|map_alt=A map of the contiguous United States showing the route of Interstate 90 as it travels from west to east through the northern states.

|length_mi=3099.74

|length_ref={{cite web |date=January 26, 2022 |title=Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021 |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table01.cfm |work=Route Log and Finder List |publisher=Federal Highway Administration |access-date=February 10, 2022 |archive-date=April 22, 2012 |archive-url=https://web.archive.org/web/20120422220808/http://www.fhwa.dot.gov/reports/routefinder/table1.cfm |url-status=live }}

|established=1956

|direction_a=West

|direction_b=East

|terminus_a={{Jct|state=WA|SR|519}} in Seattle, WA

|junction={{plainlist|1=

{{Jct|country=USA|I|5}} in Seattle, WA
{{Jct|country=USA|I|15}} near Butte, MT
{{Jct|country=USA|I|25}} near Buffalo, WY
{{Jct|country=USA|I|35}} in Albert Lea, MN
{{Jct|country=USA|I|55}} in Chicago, IL
{{Jct|country=USA|I|65}} in Gary, IN
{{Jct|country=USA|I|80|I|94|US|6}} in Lake Station, IN
{{Jct|country=USA|I|75}} in Rossford, OH
{{Jct|country=USA|I|80}} in Elyria, OH
{{Jct|country=USA|I|87|dab1=New York}} in Albany, NY
{{Jct|country=USA|I|95}} in Weston, MA}}

|terminus_b={{Jct|state=MA|Route|1A|extra=Airport}}/Logan International Airport in Boston, MA

|states= Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts

}}

Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at {{convert|3,099.7|mi|km|}}. It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain West, Great Plains, Midwest, and the Northeast, ending in Boston, Massachusetts. The highway serves 13 states and has 15 auxiliary routes, primarily in major cities such as Chicago, Cleveland, Buffalo, and Rochester.

I-90 begins at Washington State Route 519 in Seattle and crosses the Cascade Range in Washington and the Rocky Mountains in Montana. It then traverses the northern Great Plains and travels southeast through Wisconsin and the Chicago area by following the southern shore of Lake Michigan. The freeway continues across Indiana and follows the shore of Lake Erie through Ohio and Pennsylvania to Buffalo. I-90 travels across New York by roughly following the historic Erie Canal and traverses Massachusetts, reaching its eastern terminus at Massachusetts Route 1A near Logan International Airport in Boston.

The freeway was established by the Federal-Aid Highway Act of 1956, replacing a series of existing U.S. highways that had been preceded by local roads and auto trails established in the early 20th century. I-90 was numbered in 1957, reflecting its status as the northernmost transcontinental route of the system, and construction was underway on several sections with funding from the Federal-Aid Highway Act.

The route also incorporates several toll roads that predate the Interstate Highway System, including the Jane Addams Memorial Tollway, Indiana Toll Road, Ohio Turnpike, New York State Thruway, and the Massachusetts Turnpike. These toll roads opened in the 1950s and were followed by toll-free sections in Pennsylvania and Wisconsin that were finished in the 1960s. The Midwestern sections of I-90 were fully completed in 1978, and most of the route between Seattle and South Dakota opened by 1987. The final section, near the western terminus in Seattle, opened in September 1993; an eastern extension in Boston was completed in 2003 as part of the Big Dig project.

Route description

|Interstate 90 in Washington

|{{convert|296.92|mi|km|disp=table}}

|Interstate 90 in Idaho

|{{convert|73.55|mi|km|disp=table}}

|Interstate 90 in Montana

|{{convert|552.46|mi|km|disp=table}}

|Interstate 90 in Wyoming

|{{convert|208.80|mi|km|disp=table}}

|Interstate 90 in South Dakota

|{{convert|412.76|mi|km|disp=table}}

|Interstate 90 in Minnesota

|{{convert|275.70|mi|km|disp=table}}

|Interstate 90 in Wisconsin

|{{convert|187.13{{cite book |author= Southwest Region Staff |title= State Trunk Highway Log for Southwest Region |date= December 31, 2008 |publisher= Wisconsin Department of Transportation |location=Madison, WI |type= XLS |at= 090E}}

|mi|km|disp=table}}

|Interstate 90 in Illinois

|{{convert|123.89|mi|km|disp=table}}

|Interstate 90 in Indiana

|{{convert|156.28|mi|km|disp=table}}

|Interstate 90 in Ohio

|{{convert|244.75|mi|km|disp=table}}

|Interstate 90 in Pennsylvania

|{{convert|46.30|mi|km|disp=table}}

|Interstate 90 in New York

|{{convert|385.48|mi|km|disp=table}}

|Interstate 90 in Massachusetts

|{{convert|135.72|mi|km|disp=table}}

|Total

|{{convert|3,099.74|mi|km|disp=table}}

I-90 is the longest Interstate Highway in the United States, spanning {{convert|3,099.7|mi|km}} across the northern portion of the coterminous part of the country. The transcontinental freeway passes through 13 states in the Pacific Northwest, Mountain West, Great Plains, Midwest, and the Northeast regions of the United States.{{cite web |year=2010 |title=Eisenhower Interstate Highway System, Previous Facts of the Day |url=https://highways.dot.gov/highway-history/interstate-system/50th-anniversary |publisher=Federal Highway Administration |access-date=November 28, 2021 |archive-date=August 8, 2020 |archive-url=https://web.archive.org/web/20200808130349/https://www.fhwa.dot.gov/interstate/previousfacts.cfm |url-status=live }}{{google maps |title=Overview of Interstate 90 |url=https://www.google.com/maps/dir/47.5902689,-122.3290545/43.7992152,-99.3498824/41.8495308,-87.644372/42.6648806,-73.7289984/42.3776024,-71.0270117/@44.1147106,-105.6436969,3287233m/am=t/data=!3m2!1e3!4b1!4m13!4m12!1m5!3m4!1m2!1d-106.6246939!2d44.3328471!3s0x5335770ccdea65cf:0xc100e85f0a55d267!1m0!1m0!1m0!1m0!3e0!4e1 |accessdate=November 29, 2021}} From the Wisconsin–Illinois state line to Massachusetts, approximately {{convert|760|mi|km}} of I-90 uses turnpikes and other tolled highways with the exception of segments in Chicago, northeastern Ohio, Pennsylvania, and Albany, New York. The toll road sections comprise 25 percent of the freeway's total length.{{cite web |author=((FHWA Office of Transportation Policy Studies)) |date=September 2009 |title=Longer Combination Vehicles on Exclusive Truck Lanes: Interstate 90 Corridor Case Study |url=https://www.fhwa.dot.gov/policy/otps/110721/sec1.cfm |publisher=Federal Highway Administration |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232848/https://www.fhwa.dot.gov/policy/otps/110721/sec1.cfm |url-status=live }}

According to 2011 data from the Federal Highway Administration, the busiest section of I-90 is in the Chicago area, where a daily average of 306,574 vehicles use the freeway. The lowest daily traffic counts on I-90 were recorded in Wyoming, where an average of 9,820 vehicles used rural sections of the freeway.{{cite web |author=((FHWA Office of Highway Policy Information)) |date=August 2013 |title=2011 Interstate Brief: Summary of the Interstate System by State and Route Number |pages=4, 15 |url=https://www.fhwa.dot.gov/interstatebrief2011/2011interstatebrief.pdf |publisher=Federal Highway Administration |accessdate=April 3, 2022 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232847/https://www.fhwa.dot.gov/interstatebrief2011/2011interstatebrief.pdf |url-status=live }}

=Washington=

File:I-90 as seen from Mount Si.jpg|alt=Aerial view of a divided highway making two turns in a densely forested area.]]

The western terminus of I-90 is at an intersection with Washington State Route 519 and 4th Avenue South in the SoDo neighborhood of Seattle. The junction is south of Downtown Seattle, adjacent to the Port of Seattle and two major sports stadiums, Lumen Field and T-Mobile Park.{{cite news |last=Lindblom |first=Mike |date=August 6, 2008 |title=Port clears way for I-90 link to waterfront |page=B2 |url=http://old.seattletimes.com/html/localnews/2008094653_sodo06m.html |work=The Seattle Times |url-status=dead |archive-url=https://web.archive.org/web/20180616130827/http://old.seattletimes.com/html/localnews/2008094653_sodo06m.html |archive-date=June 16, 2018 |accessdate=November 28, 2021}} The freeway travels east through an interchange with I-5 and around Beacon Hill before it enters the Mount Baker Ridge Tunnel alongside the future 2 Line of the Link light rail system, set to open in 2025.{{cite news |last=Lee |first=Jessica |date=May 11, 2017 |title=From the archives: A look back at the I-90 floating bridges before light-rail work begins |url=https://www.seattletimes.com/seattle-news/transportation/from-the-archives-a-look-back-on-i-90-floating-bridges-before-light-rail-work-begins/ |work=The Seattle Times |accessdate=November 28, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129064619/https://www.seattletimes.com/seattle-news/transportation/from-the-archives-a-look-back-on-i-90-floating-bridges-before-light-rail-work-begins/ |url-status=live }}{{cite news |last=Lindblom |first=Mike |date=March 10, 2023 |title=Sound Transit will shell out millions to keep pace with construction delays |url=https://www.seattletimes.com/seattle-news/transportation/sound-transit-will-shell-out-millions-to-keep-pace-with-construction-delays/ |work=The Seattle Times |accessdate=August 23, 2023 |archive-date=August 24, 2023 |archive-url=https://web.archive.org/web/20230824065723/https://www.seattletimes.com/seattle-news/transportation/sound-transit-will-shell-out-millions-to-keep-pace-with-construction-delays/ |url-status=live }} I-90 emerges from the tunnel on a pair of floating bridges, among the longest of their kind: the eastbound-only Lacey V. Murrow Memorial Bridge and the Homer M. Hadley Memorial Bridge, which carries westbound traffic and the future light rail line.{{cite WSDOT map |year=2014 |link=yes |accessdate=November 28, 2021}}

The floating bridges cross Lake Washington to Mercer Island, where I-90 travels through a series of tunnels under {{convert|14|acre|ha}} of parkland, including Aubrey Davis Park.{{cite news |last=Reynolds |first=Peggy |date=September 9, 1993 |title=Last link of I-90 ends 30-year saga |page=A10 |url=https://archive.seattletimes.com/archive/?date=19930909&slug=1720198 |work=The Seattle Times |access-date=November 28, 2021 |archive-date=October 5, 2021 |archive-url=https://web.archive.org/web/20211005014301/https://archive.seattletimes.com/archive/?date=19930909&slug=1720198 |url-status=live }}{{cite news |last=Johnston |first=Steve |date=September 9, 1993 |title=Hey Johnston: What's that big concrete thing floating on Lake Washington? |page=1 |url=https://archive.seattletimes.com/archive/?date=19930909&slug=1720153 |work=The Seattle Times |access-date=November 28, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232848/https://archive.seattletimes.com/archive/?date=19930909&slug=1720153 |url-status=live }} The freeway continues from the island and enters Bellevue, the largest city of the Eastside region, and intersects I-405 near Factoria. I-90 then travels along Lake Sammamish and through Issaquah as it leaves the Seattle metropolitan area and ascends into the Cascade Range on the Mountains to Sound Greenway, a designated National Heritage Area and National Scenic Byway.{{cite web |title=Mountains to Sound Greenway National Heritage Area |url=https://www.nps.gov/places/mountains-to-sound-greenway-national-heritage-area.htm |publisher=National Park Service |accessdate=November 28, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129064619/https://www.nps.gov/places/mountains-to-sound-greenway-national-heritage-area.htm |url-status=live }} The freeway crosses Snoqualmie Pass, elevation {{convert|3,022|ft|m}}, at the crest of the mountain range near a ski resort.{{cite news |last=Hill |first=Craig |date=January 10, 2014 |title=Snoqualmie opening benefits all |page=A1 |work=The News Tribune |url=https://www.newspapers.com/clip/89735243/snoqualmie-opening-benefits-all/ |via=Newspapers.com |accessdate=November 28, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129064620/https://www.newspapers.com/clip/89735243/snoqualmie-opening-benefits-all/ |url-status=live }}

From Snoqualmie Pass, I-90 follows the Yakima River into the Kittitas Valley and intersects I-82 in Ellensburg after a brief concurrency with U.S. Route 97 (US 97). The highway crosses the Columbia River on the Vantage Bridge and turns northeast to climb the cliffs of the Columbia Plateau near George. After traveling east across Moses Lake and the surrounding agricultural region, I-90 begins a long concurrency with US 395 at Ritzville as the highways turn northeast towards Spokane. I-90/US 395 is joined by US 2 through western Spokane, where it intersects US 195. The freeway crosses downtown Spokane on an elevated viaduct and splits from US 2 and US 395 to continue east across Spokane Valley towards the Idaho state line.

=Idaho=

File:I-90 viaduct in Wallace, ID - looking eastbound from 6th Street.jpg, opened in 1991 as one of the last sections of I-90.|alt=View underheath an elevated highway on the shores of a narrow river flanked by rocks and walls]]

I-90 traverses the Idaho Panhandle region at the north end of the state, where it connects Coeur d'Alene to communities in the Silver Valley. From the Washington state line, the freeway follows the Spokane River through Post Falls and Huetter to the city of Coeur d'Alene, where it intersects US 95, the state's main north–south highway.{{cite news |last=Titone |first=Julie |date=August 25, 1996 |title=Highway 95: From top to bottom, we explore Idaho's famed roadway |page=E1 |url=https://www.spokesman.com/stories/1996/aug/25/highway-95-from-top-to-bottom-we-explore-idahos/ |work=The Spokesman-Review |accessdate=November 29, 2021 |archive-date=September 14, 2023 |archive-url=https://web.archive.org/web/20230914044803/https://www.spokesman.com/stories/1996/aug/25/highway-95-from-top-to-bottom-we-explore-idahos/ |url-status=live }} I-90 then turns southeast to bypass Coeur d'Alene and travel along a series of ridges that face Lake Coeur d'Alene, crossing an arm of the lake on the Veterans Memorial Centennial Bridge.{{cite news |date=February 10, 2017 |title=Bennett Bay Bridge offers best of form and function |url=https://apps.itd.idaho.gov/Apps/MediaManagerMVC/transporter/2017/021017_Trans/021017_VaultBennettBayBr.html |work=The Transporter |publisher=Idaho Transportation Department |accessdate=November 30, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232854/https://apps.itd.idaho.gov/Apps/MediaManagerMVC/transporter/2017/021017_Trans/021017_VaultBennettBayBr.html |url-status=live }}

The freeway continues east across Fourth of July Summit and descends into the Silver Valley, where it follows the Coeur d'Alene River through several small towns along the historic Mullan Road. I-90 serves the cities of Kellogg and Wallace before it ascends into the Bitterroot Range and crosses Lookout Pass, which also marks the Montana state line.

=Montana=

File:I-90 eastbound at Lookout Pass on the Idaho-Montana border.jpg on the Idaho–Montana border|alt=A simple overpass over a divided highway seen from a grassy area on the side of the road]]

Montana has the longest section of I-90, at almost {{convert|552|mi|km}}, despite the highway only serving a portion of the state's east–west width.{{cite map |year=2021 |title=Montana Official Highway Map |url=https://mdt.mt.gov/travinfo/docs/2021-mt-highway-map.pdf |location=Helena |publisher=Montana Department of Transportation |scale=Scale not given |accessdate=November 29, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201004352/https://mdt.mt.gov/travinfo/docs/2021-mt-highway-map.pdf |url-status=live }} It descends from Lookout Pass along the St. Regis and Clark Fork rivers between the foothills of the Bitteroot Range and Coeur d'Alene Mountains. The freeway travels east through the Alberton Gorge and crosses the Clark Fork River several times before it reaches the head of the Missoula Valley.{{cite news |last=Gadbow |first=Daryl |date=July 22, 2004 |title=Gorgeous Gorge |page=C1 |work=The Missoulian |url=https://www.newspapers.com/clip/89736594/gorgeous-gorge/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129085211/https://www.newspapers.com/clip/89736594/gorgeous-gorge/ |url-status=live }} After a short concurrency with US 93, I-90 runs along the north side of Missoula and joins US 12 to continue southeast along the foothills of the Garnet Range and Sapphire Mountains.

After it splits from US 12 in Garrison, the freeway turns south to traverse the Deer Lodge Valley. It then turns east to serve Butte, where it overlaps with I-15 for {{convert|8|mi|km|spell=in}} and intersects I-115. I-90 then continues southeast and crosses the Rocky Mountains and Continental Divide at Homestake Pass, which is the highest point on the entire Interstate at {{convert|6329|ft|m}}.{{cite news |last=Smith |first=Mike |date=September 22, 2016 |title=Slower speed limit in works for most of Homestake Pass |page=A1 |work=The Montana Standard |url=https://www.newspapers.com/clip/89736816/slower-speed-limit-in-works-for-most-of/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129085211/https://www.newspapers.com/clip/89736816/slower-speed-limit-in-works-for-most-of/ |url-status=live }} The freeway travels east across the Jefferson Valley and passes the headwaters of the Missouri River near Three Forks. It then enters the Gallatin Valley.{{cite news |last=Jokerst |first=Gail |date=June 10, 2001 |title=Headwaters haven: Three Forks a quaint slice of Montana's history |page=H4 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/89737271/headwaters-haven-three-forks-a-quaint/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129091500/https://www.newspapers.com/clip/89737271/headwaters-haven-three-forks-a-quaint/ |url-status=live }}

I-90 travels around Bozeman, where it is joined by US 191, and crosses Bozeman Pass between the Bridger and Gallatin mountains. At the east end of the mountains, the freeway begins to follow the Yellowstone River and is briefly concurrent with US 89, which serves Yellowstone National Park, and splits from US 191 at Big Timber. I-90 continues along the Yellowstone River through Billings, overlapping with US 87 and US 212, until it reaches Lockwood, the western terminus of I-94. The freeways split and I-90 continues east across the Bighorn Basin before it turns south near Hardin to follow the Little Bighorn River into the Crow Indian Reservation. The highway passes the site of the Battle of the Little Bighorn near Crow Agency and continues south along the river and the Wolf Mountains into Wyoming.{{cite news |last=Pyle |first=Richard |date=August 17, 2003 |title=The victors at Little Bighorn |page=N5 |work=The Philadelphia Inquirer |url=https://www.newspapers.com/clip/89737083/the-victors-at-little-bighorn/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129085212/https://www.newspapers.com/clip/89737083/the-victors-at-little-bighorn/ |url-status=live }}

From 1995 to 1999, there was no numbered daytime speed limit on rural highways in Montana, including I-90.{{cite news |last=Whitely |first=Peyton |date=December 10, 1995 |title=With a roar, Montana drops day speed limit |page=A1 |url=https://archive.seattletimes.com/archive/?date=19951210&slug=2157057 |work=The Seattle Times |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129090327/https://archive.seattletimes.com/archive/?date=19951210&slug=2157057 |url-status=live }} The speed limit was simply defined as "reasonable and proper" as determined on a case-by-case basis by the Montana Highway Patrol until the Montana Supreme Court ruled it was unconstitutional.{{cite news |last=Robbins |first=Jim |date=December 25, 1998 |title=Montana's Speed Limit of ?? M.P.H. Is Overturned as Too Vague |page=A20 |url=https://www.nytimes.com/1998/12/25/us/montana-s-speed-limit-of-mph-is-overturned-as-too-vague.html |work=The New York Times |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129090327/https://www.nytimes.com/1998/12/25/us/montana-s-speed-limit-of-mph-is-overturned-as-too-vague.html |url-status=live }} The maximum daytime speed limit in Montana was initially set at {{convert|75|mph|km/h|abbr=on|round=5}} in 1999 and was later raised to {{convert|80|mph|km/h|abbr=on|round=5}} in 2015.{{cite news |last=Carter |first=Troy |date=October 1, 1995 |title=Montana interstate speed limit raised to 80 mph—mostly |url=https://www.bozemandailychronicle.com/news/montana-interstate-speed-limit-raised-to-80-mph-mostly/article_7dee866c-c7ca-5002-aee3-72c6335fd1be.html |work=Bozeman Daily Chronicle |url-status=dead |archive-url=https://web.archive.org/web/20211129090331/https://www.bozemandailychronicle.com/news/montana-interstate-speed-limit-raised-to-80-mph-mostly/article_7dee866c-c7ca-5002-aee3-72c6335fd1be.html |archive-date=November 29, 2021 |accessdate=November 29, 2021}}

=Wyoming=

File:Sheridan.JPG, from I-90|alt=A multi-story building named the "Mill Inn" and tall grain elevator, seen from an elevated vantage point]]

I-90 serves a portion of northeastern Wyoming that is primarily rural.{{cite news |date=August 21, 2015 |title=Speed limit upped to 80 mph on part of I-90 in NE Wyoming |url=https://www.argusleader.com/story/news/2015/08/21/speed-limit-upped-mph-part-ne-wyoming/32103899/ |work=Argus Leader |location=Sioux Falls |agency=Associated Press |accessdate=November 29, 2021}} The freeway, briefly concurrent to US 14, travels southeast along a series of creeks to Sheridan in the northeastern foothills of the Bighorn Mountains. I-90 and US 87 split in Sheridan and travel parallel to each other to Fort Phil Kearny, where they rejoin and continue south past Lake Desmet to Buffalo. The highways split again near Buffalo at a junction with I-25, which overlaps with US 87 to Casper.{{cite map |author=Public Affairs Office |year=2011 |title=Wyoming Highway Map |url=https://ss-usa.s3.amazonaws.com/c/308475559/media/77046075a7b15c06968218036445366/Wyoming%20map%20side_v2.pdf |scale=1 inch = approx. 18 miles |location=Cheyenne |publisher=Wyoming Department of Transportation |via=Wyoming Office of Tourism |access-date=November 29, 2021 |archive-date=October 3, 2021 |archive-url=https://web.archive.org/web/20211003035101/https://ss-usa.s3.amazonaws.com/c/308475559/media/77046075a7b15c06968218036445366/Wyoming%20map%20side_v2.pdf |url-status=live }}

From Buffalo, the highway turns east to cross the Powder River Basin, a region with several large coal mines.{{cite news |last=Learn |first=Scott |date=July 1, 2012 |title=Coal clash: The Powder River Basin, where coal is king |url=https://www.oregonlive.com/environment/2012/06/coal_clash_out_of_the_gigantic.html |work=The Oregonian |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129094519/https://www.oregonlive.com/environment/2012/06/coal_clash_out_of_the_gigantic.html |url-status=live }} I-90 then reaches Gillette, where it begins a concurrency with US 14 and US 16 to a three-way split in Moorcroft. The freeway continues into the Bear Lodge Mountains (part of the Black Hills) and is rejoined in Sundance by US 14, which looped north to serve the Devils Tower.{{cite news |last=Eldredge |first=Kay |date=August 29, 1982 |title=The Spell of Devils Tower |at=sec. 10, p. 25 |url=https://www.nytimes.com/1982/08/29/travel/the-spell-of-devils-tower.html |work=The New York Times |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102103/https://www.nytimes.com/1982/08/29/travel/the-spell-of-devils-tower.html |url-status=live }} I-90/US 14 then continues northeast to Beulah, where it enters South Dakota.

=South Dakota=

File:CHAMBERLAIN INTERSTATE BRIDGE.jpg, which carries I-90 over the Missouri River near Chamberlain, South Dakota|alt=Distant view of a simple highway bridge crossing a wide river surrounded by rolling hills free of vegetation]]

I-90/US 14 enters South Dakota near Spearfish and travels east through prairie land, where it is briefly concurrent with US 85. Beyond Sturgis, the freeway turns south and follows the edge of the Black Hills to Rapid City, the gateway to Mount Rushmore.{{cite news |last=Henry |first=Neil |date=January 3, 1987 |title=Hush of the quiet season descends on the Black Hills |url=https://www.washingtonpost.com/archive/politics/1987/01/03/hush-of-the-quiet-season-descends-on-the-black-hills/00e14802-109a-4e1e-974e-90b2b5cc838e/ |newspaper=The Washington Post |accessdate=November 29, 2021}} It then skirts the northern edge of Rapid City, which is served by spur route I-190, and passes Ellsworth Air Force Base while it continues east across the plains. I-90 splits from US 14 near Wall, home to the Wall Drug roadside attraction and located northeast of Badlands National Park.{{cite news |last=Gordon |first=Kindra |date=June 11, 2006 |title=Get away from it all |page=D1 |work=Rapid City Journal |url=https://www.newspapers.com/clip/89737914/get-away-from-it-all/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102613/https://www.newspapers.com/clip/89737914/get-away-from-it-all/ |url-status=live }}{{cite map |year=2019 |title=State Highway Map of South Dakota |scale=1 inch = approx. 15.43 miles |url=https://dot.sd.gov/media/documents/CADD-Mapping/State/SD-Map_medium.pdf |location=Pierre |publisher=South Dakota Department of Transportation |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232847/https://dot.sd.gov/media/documents/CADD-Mapping/State/SD-Map_medium.pdf |url-status=live }}

The freeway travels southeast into the Buffalo Gap National Grassland and also passes a pair of decommissioned missile silos that form the Minuteman Missile National Historic Site.{{cite map |year=2019 |title=Motor Vehicle Use Map: Buffalo Gap National Grassland, South Dakota |url=https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd701419.pdf |scale=Scale not given |location=Washington, D.C. |publisher=United States Forest Service |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102615/https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd701419.pdf |url-status=live }}{{cite news |last=Bures |first=Frank |date=March 21, 2013 |title=Spring Travel Issue: Cold War-era tourist sites feature weapons of mass attraction |url=https://www.washingtonpost.com/blogs/liveblog/wp/2013/03/21/magazine-spring-travel-issue-cold-war-era-tourist-sites-feature-weapons-of-mass-attraction/ |newspaper=The Washington Post |accessdate=November 29, 2021}} I-90 continues east along the top of a plateau that faces the White River and passes near Kadoka and Murdo. US 83 briefly joins the highway from Murdo to Vivian, where it splits off to serve the state capital of Pierre. It then crosses the Missouri River on the Lewis and Clark Memorial Bridge near Chamberlain and passes a rest area which overlooks the river and includes the {{convert|50|ft|m|adj=mid}} Dignity statue.{{cite news |date=June 15, 2021 |title=From cowboys to missiles: Places to stop this summer on your I-90 road trip |url=https://www.keloland.com/keloland-com-original/from-cowboys-to-missiles-places-to-stop-this-summer-on-your-i-90-road-trip/ |publisher=Keloland.com |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232850/https://www.keloland.com/keloland-com-original/from-cowboys-to-missiles-places-to-stop-this-summer-on-your-i-90-road-trip/ |url-status=live }} From Chamberlain, I-90 continues east across the plains and past several small towns near the city of Mitchell. It then reaches the Sioux Falls area, where it bypasses the city to the north and intersects I-29 and I-229. I-90 leaves Sioux Falls and crosses into Minnesota near Brandon.

=Minnesota=

File:I90GoldenSpikeRestAreaBlueEarthMN.jpg to commemorate the completion of I-90 in 1978 near Blue Earth, Minnesota|alt=A park with several trees and picnic tables behind a plaque titled "A Golden Dedication for I-90"]]

I-90 crosses the southern portion of Minnesota and carries unsigned Legislative Route 391 across the state.{{cite web |year=2021 |title=Section 161.12: Additional Routes Added; Federal Aid |url=https://www.revisor.mn.gov/statutes/cite/161.12 |work=Minnesota Statutes |publisher=Minnesota Revisor's Office |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130051250/https://www.revisor.mn.gov/statutes/cite/161.12 |url-status=live }} From the South Dakota border near Beaver Creek to Albert Lea, the freeway travels east across farmland and towns in the plains and rolling hills of the Buffalo Ridge. It also intersects several north–south highways, including US 75 in Luverne, US 59 in Worthington, US 71 in Jackson, and US 169 in Blue Earth. I-90 travels around the northern outskirts of Albert Lea and intersects I-35 northeast of the city. It then reaches Austin and a brief concurrency with US 218.{{cite map |year=2021 |title=Minnesota 2021–2022 Official Highway Map |url=https://www.dot.state.mn.us/statemap/2019/Frontside_2021.pdf |scale=Scale not given |location=St. Paul |publisher=Minnesota Department of Transportation |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129111357/http://www.dot.state.mn.us/statemap/2019/Frontside_2021.pdf |url-status=live }}

From Austin, the freeway turns northeast to head towards Rochester, which it bypasses to the south and intersects US 63 and US 52. I-90 continues east into the hilly Driftless Area and descends from the bluffs that overlook Lake Onalaska on the Mississippi River.{{cite news |last=Stoll |first=Mike |date=May 26, 2017 |title=I-90 and the face of Mower County |url=https://www.austindailyherald.com/2017/05/i-90-and-the-face-of-mower-county/ |work=Austin Daily Herald |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232849/https://www.austindailyherald.com/2017/05/i-90-and-the-face-of-mower-county/ |url-status=live }} It turns southeast at Dakota and is joined by US 14 until the highways split near La Crescent. I-90 turns east before it reaches La Crescent, where it crosses the Mississippi River on the Dresbach Bridge into Wisconsin.{{cite news |last=Hubbuch |first=Chris |date=October 21, 2016 |title=Minnesota, Wisconsin celebrate completion of I-90 bridge |url=https://lacrossetribune.com/news/local/minnesota-wisconsin-celebrate-completion-of-i-90-bridge/article_4c810c59-8678-56cb-a34a-e27ef81e07b2.html |work=La Crosse Tribune |url-access=subscription |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130051250/https://lacrossetribune.com/news/local/minnesota-wisconsin-celebrate-completion-of-i-90-bridge/article_4c810c59-8678-56cb-a34a-e27ef81e07b2.html |url-status=live }}

=Wisconsin=

File:I 90 bridge La Crosse.jpg bridge near La Crosse]]

I-90 enters Wisconsin near La Crosse and bisects French Island before it reaches Onalaska. This section is briefly concurrent to US 53 between La Crosse and Onalaska. The freeway travels east, generally along the La Crosse River, through several towns and Fort McCoy before it reaches a junction with I-94 in Tomah. The two Interstates join at Tomah and travel southeast along the edge of the hills of the Western Upland, following the Lemonweir and Wisconsin rivers. It passes Wisconsin Dells, situated on the gorge of the same name and home to several water parks and theme parks.{{cite news |last=Noel |first=Josh |date=June 14, 2016 |title=A first-timer from Chicago dives into the Wisconsin Dells |url=https://www.chicagotribune.com/travel/ct-trav-0626-dells-first-timer-20160613-story.html |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232850/https://www.chicagotribune.com/travel/ct-trav-0626-dells-first-timer-20160613-story.html |url-status=live }}{{cite map |year=2019 |title=Wisconsin 2019–2020 State Highway Map |scale=1 inch = approx. 13 miles |url=https://wisconsindot.gov/Documents/travel/road/hwy-maps/statemap.pdf |location=Madison |publisher=Wisconsin Department of Transportation |accessdate=November 29, 2021 |archive-date=January 29, 2022 |archive-url=https://web.archive.org/web/20220129024329/https://wisconsindot.gov/Documents/travel/road/hwy-maps/statemap.pdf |url-status=live }}

The freeway travels east from Wisconsin Dells to the Portage area, where I-39 begins its concurrency with I-90/I-94. The highway then crosses the Wisconsin River and travels south towards Madison, where it forms an eastern bypass of the city. East of Madison, I-94 separates from I-39/I-90, which continues southeast through Edgerton and Janesville. The highway turns south and enters Beloit, where it intersects I-43 and crosses into Illinois.

=Illinois=

File:Highway Isometric.jpg, looking southeast towards the Chicago skyline|alt=View of the Chicago skyline, including the prominent Willis Tower, with a divided highway leading towards it]]

I-90 uses several sections of the Illinois Tollway system as it traverses the northeastern corner of the state, primarily in the Chicago metropolitan area. It enters the state from Beloit, Wisconsin, and remains concurrent to I-39 and US 51 on the Jane Addams Memorial Tollway through the eastern outskirts of Rockford, where the highways split off. I-90 continues on the tollway as it follows US 20 southeast through Belvidere and Elgin in the Fox Valley.{{cite map |date=January 2020 |title=Illinois Tollway 2020 Complimentary Map |at=[https://www.illinoistollway.com/documents/20184/145046/TollwayMap_01_29_2020-SideB.pdf Chicago and Vicinity] inset |url=https://www.illinoistollway.com/documents/20184/145046/TollwayMap_01_22_2020-SideA.pdf |scale=Scale not given |location=Downers Grove |publisher=Illinois State Toll Highway Authority |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130073626/https://www.illinoistollway.com/documents/20184/145046/TollwayMap_01_22_2020-SideA.pdf |url-status=live }}

The tollway cuts through the northwestern suburbs of Chicago, where it intersects I-290 in Schaumburg and passes the north side of O'Hare International Airport. On the east side of the airport in Rosemont, I-90 intersects I-294 and I-190, the latter of which serves the airport's passenger terminals and marks the end of the tollway. The freeway, now named the Kennedy Expressway, travels through northwestern Chicago, where the Blue Line of the "L" rapid transit system runs in the median and serves several stops.{{cite news |last=Hilkevitch |first=Jon |date=December 5, 2013 |title=O'Hare Blue Line to stay open during 4-year renovation |url=https://www.chicagotribune.com/news/ct-xpm-2013-12-05-chi-4year-492m-blue-line-project-to-be-announced-today-20131205-story.html |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009230610/https://www.chicagotribune.com/ |url-status=live }} I-90 turns southeast and is rejoined by I-94 in Irving Park, where it gains a set of reversible express lanes that travel for {{convert|6.2|mi|km}} toward the Near West Side.{{cite news |last=Hilkevitch |first=Jon |date=August 22, 2011 |title=Drivers frustrated by Kennedy express lanes |url=https://www.chicagotribune.com/autos/ct-xpm-2011-08-22-ct-met-getting-around-0822-20110822-story.html |at=sec. 1, p. 4 |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130071337/https://www.chicagotribune.com/autos/ct-xpm-2011-08-22-ct-met-getting-around-0822-20110822-story.html |url-status=live }}

The Kennedy Expressway travels south through the Near West Side, opposite the Chicago River from the Chicago Loop (the city's central business district), and intersects I-290 again at the Jane Byrne Interchange.{{cite news |last=Wronski |first=Richard |date=November 23, 2015 |title=Kennedy Expressway tops new list of nation's most congested highways |url=https://www.chicagotribune.com/news/ct-kennedy-congestion-met-20151123-story.html |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130071339/https://www.chicagotribune.com/news/ct-kennedy-congestion-met-20151123-story.html |url-status=live }} The freeway continues onto the Dan Ryan Expressway and crosses the Chicago River near Chinatown and an interchange with I-55. The Dan Ryan is the widest section of I-90, at 12 through lanes, and is split between local and express lanes.{{cite web |date=July 27, 2010 |title=Urban Highways with the Most Lanes |url=https://www.fhwa.dot.gov/policyinformation/tables/01.pdf |publisher=Federal Highway Administration |access-date=December 3, 2021 |archive-date=January 6, 2022 |archive-url=https://web.archive.org/web/20220106214052/http://www.fhwa.dot.gov/policyinformation/tables/01.pdf |url-status=live }}{{cite news |last=Hilkevitch |first=Jon |date=March 26, 2006 |title=Buckle up, it looks like a long ride |at=sec. 1, p. 10 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89956956/buckle-up-it-looks-like-a-long-ride/ |via=Newspapers.com |accessdate=December 3, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232850/https://www.newspapers.com/clip/89956956/buckle-up-it-looks-like-a-long-ride/ |url-status=live }} I-90/I-94 is joined by the "L" Red Line in the median of the expressway through the city's South Side, where it passes Rate Field, the Illinois Institute of Technology campus, and Washington Park.{{cite news |last=Channick |first=Robert |date=January 31, 2017 |title=IIT sells oldest building for redevelopment |url=https://www.chicagotribune.com/business/ct-iit-redevelop-historic-building-0201-biz-20170131-story.html |work=Chicago Tribune |accessdate=November 29, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130071922/https://www.chicagotribune.com/business/ct-iit-redevelop-historic-building-0201-biz-20170131-story.html |url-status=live }} I-90 splits from the Dan Ryan Expressway in Englewood and turns southeast onto the tolled Chicago Skyway. The tolled Skyway travels towards the Indiana state line, which the freeway crosses near the Calumet River in the East Side.

=Indiana=

File:Aetna i90.jpg (carrying I-90) in Gary, Indiana|alt=An overhead view of a divided highway with six lanes and a raised median barrier traveling through a rural area]]

The entirety of I-90 within Indiana is concurrent with the Indiana Toll Road, which crosses the state's northern fringe and is mostly shared with I-80.{{cite map |year=2021 |title=Indiana Roadway Map 2021 |url=https://www.in.gov/indot/files/2021_Roadway_Map-NEW-SIZEuseHQextendededit.pdf |publisher=Indiana Department of Transportation |scale=Scale not given |location=Indianapolis |accessdate=November 30, 2021 |archive-date=November 2, 2021 |archive-url=https://web.archive.org/web/20211102152650/https://www.in.gov/indot/files/2021_Roadway_Map-NEW-SIZEuseHQextendededit.pdf |url-status=live }} From the Illinois state line, the tollway travels south through Hammond and turns east to follow the Grand Calumet River through northern Gary, where it intersects US 41 and US 12. I-90 then crosses I-65 in eastern Gary and I-94 in Lake Station, where it begins a concurrency with I-80.

I-94 travels northeast near the Lake Michigan shoreline from Lake Station to Michigan City, while the Indiana Toll Road (I-80/I-90) follows it to the south. The tollway then moves closer to the Michigan–Indiana state line and turns east, passing through the northern outskirts of South Bend and Elkhart. In South Bend, it intersects US 31 and passes near the University of Notre Dame. I-80/I-90 travels parallel to the state line until it reaches an interchange with I-69 near Fremont, where it turns southeast. The tollway then turns east and crosses the Ohio state line near Angola.

=Ohio=

File:Ohio Turnpike exit 142.jpg exit 142, showing the connector between I-90 and I-80 on the turnpike|alt=Aerial view of a divided highway and several ramps that lead into a toll plaza]]

At the state line near Montpelier, I-80/I-90 transitions from the Indiana Toll Road to the Ohio Turnpike, which crosses northern Ohio. The highway continues east around several rural towns as it approaches the Toledo area. The turnpike crosses under I-475 in Maumee without an interchange; access to I-475 is instead provided through a nearby junction with US 20. I-80/I-90 then continues southeast across the Maumee River to Rossford on the southern outskirts of Toledo, where it intersects I-75.{{cite map |author=ODOT Office of Technical Services |date=April 2019 |title=Ohio Official Transportation Map |scale=1 inch = 11 miles |url=https://www.transportation.ohio.gov/static/About/maps/2019StateMap-Back.pdf |at=[https://www.transportation.ohio.gov/static/About/maps/2019StateMap-Front.pdf Cleveland] inset |location=Columbus |publisher=Ohio Department of Transportation |accessdate=November 30, 2021 |archive-date=July 14, 2021 |archive-url=https://web.archive.org/web/20210714191632/https://www.transportation.ohio.gov/static/About/maps/2019StateMap-Back.pdf |url-status=live }}

The turnpike travels southeast through a rural area near the southwest shore of Lake Erie, where it passes the cities of Fremont and Sandusky. Near Norwalk, the highway turns northeast to follow State Route 2 (SR 2) and heads to Elyria, where I-90 splits from I-80 (which remains on the turnpike). The freeway then merges with SR 2 and continues northeast through the lakeshore suburbs west of Cleveland, including Rocky River and Lakewood. I-90 and SR 2 separate after crossing the Rocky River and travel parallel to each other as they enter Cleveland. I-90 continues through the southwestern residential neighborhoods of Cleveland and reaches a junction with I-71 and I-490 in Tremont, where it turns north.

From Tremont, I-90 turns north onto the Innerbelt Freeway and crosses the Cuyahoga River into Downtown Cleveland on the George V. Voinovich Bridges.{{cite news |last=Grant |first=Alison |date=November 8, 2013 |title=Inner Belt Bridge brings crowd of onlookers with cameras, babies in strollers |url=https://www.cleveland.com/metro/2013/11/inner_belt_bridge_brings_crowd.html |work=The Plain Dealer |accessdate=November 30, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130094152/https://www.cleveland.com/metro/2013/11/inner_belt_bridge_brings_crowd.html |url-status=live }} The Innerbelt skirts the south side of Downtown Cleveland, where it intersects I-77 near Progressive Field and turns north to bisect the Goodrich–Kirtland Park neighborhood. Near Cleveland Burke Lakefront Airport, the freeway makes a sharp, 90-degree turn (nicknamed "Dead Man's Curve" for its frequent crashes{{cite news |last=Naymik |first=Mark |date=August 3, 2021 |title=Cleveland's Dead Man's Curve not getting straightened any time soon: Mark Naymik Reports |url=https://www.wkyc.com/article/news/local/cleveland/cleveland-dead-mans-curve-not-getting-straightened-any-time-soon/95-2e73c304-f903-4045-9e9c-3a8159156344 |publisher=WKYC |accessdate=November 30, 2021}}) and rejoins SR 2 on the Cleveland Memorial Shoreway until they split again in Euclid. I-90 briefly turns southeast but resumes its northeastern route after a junction with I-271 in Willoughby Hills. The freeway travels parallel to the Lake Erie shoreline through farmland and exurban towns and crosses into Pennsylvania near Conneaut.

=Pennsylvania=

Within Pennsylvania, I-90 is non-tolled and generally travels northeast around several communities on the Lake Erie shoreline and remains entirely in Erie County.{{cite map |author=PennDOT Bureau of Planning and Research |year=2020 |title=Pennsylvania Tourism and Transportation Map |url=https://gis.penndot.gov/BPR_PDF_FILES/MAPS/Statewide/otm/otmplot_web.pdf |scale=Scale not given |location=Harrisburg |publisher=Pennsylvania Department of Transportation |accessdate=November 30, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130100700/https://gis.penndot.gov/BPR_PDF_FILES/MAPS/Statewide/otm/otmplot_web.pdf |url-status=live }} It enters the state in Springfield Township and passes through rural areas along the lake shore, parallel to US 20 and the Lake Road. The freeway then travels through the southern outskirts of Erie, where it intersects I-79 and US 19. I-90 returns to the rural areas of northeastern Erie County and intersects I-86 before it reaches the New York state line near the borough of North East. At {{convert|46|mi|km}}, the Pennsylvania section is I-90's shortest within a single state.

=New York=

File:I-90 East - Exit 27 - NY30 One Mile (49175740706).jpg near Amsterdam|alt=A divided highway with two lanes in each direction, seen on a straightaway with trees off to the sides]]

I-90 enters New York in Chautauqua County and runs concurrently with the mainline of the tolled New York State Thruway. It travels northeast along the Lake Erie shoreline between Lake Road to the north and US 20 to the south through Dunkirk and Fredonia. The highways enter the Buffalo area, where the toll road runs north–south through Cheektowaga and forms an eastern bypass, using auxiliary routes I-190 and I-290 to serve the city.{{cite map |year=2001 |title=New York State Map |url=http://iloveny.com/_files/map_nys_base.pdf |at=[https://web.archive.org/web/20091231053955/http://iloveny.com/_files/map_metro_albany.pdf Albany/Schenectady/Troy Metro] inset|cartography=Maps.com |scale=Scale not given |location=Albany |publisher=New York State Department of Economic Development |url-status=dead |archive-url=https://web.archive.org/web/20091231053250/http://iloveny.com/_files/map_nys_base.pdf |archive-date=December 31, 2009 |accessdate=November 30, 2021}} At a junction with I-290 near Buffalo Niagara International Airport, I-90 turns east to follow the historic Water Level Route of the New York Central Railroad, itself parallel to the 19th-century Erie Canal.{{cite web |year=2020 |title=Erie Canalway Map & Guide |pages=4–5 |url=http://npshistory.com/publications/erie/newspaper/2020.pdf |publisher=National Park Service |url-status=dead |archive-url=https://web.archive.org/web/20211201043819/http://npshistory.com/publications/erie/newspaper/2020.pdf |archive-date=December 1, 2021 |accessdate=November 30, 2021}}{{cite news |last=O'Donnell |first=Harry |date=June 25, 1950 |title=Thruway to Surpass Pennsylvania Turnpike |page=13A |work=Rochester Democrat and Chronicle |url=https://www.newspapers.com/clip/89843028/thruway-to-surpass-pennsylvania-turnpike/ |via=Newspapers.com |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201043817/https://www.newspapers.com/clip/89843028/thruway-to-surpass-pennsylvania-turnpike/ |url-status=live }}

The Thruway passes south of Rochester, which it serves via a loop on I-490 and the direct north–south spur I-390. I-90 travels through the Finger Lakes region and moves closer to the Erie Canal as it approaches the Syracuse area. It travels through the city's northern outskirts, where it intersects I-690, I-81, and I-481 from west to east.{{cite map |author=Syracuse Metropolitan Transportation Council |date=June 2016 |title=2016 Highway Map of Onondaga County, New York |url=http://www.ongov.net/dot/documents/2016HighwayMapofOnondagaCounty.pdf |scale=Scale not given |location=Syracuse |publisher=Onondaga County Department of Transportation |accessdate=November 30, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232852/http://www.ongov.net/dot/documents/2016HighwayMapofOnondagaCounty.pdf |url-status=live }} It then continues to Utica, where the Thruway runs along the north side of the Mohawk River (part of the Erie Canal). The section through Utica, connected to the city's downtown via I-790, was built between the lines of SR 49, which does not merge with the Thruway.

I-90 then closely follows the Mohawk River southeast through several towns and villages between the foothills of the Catskill and Adirondack mountains. The Thruway then reaches Schenectady, which it bypasses to the southwest and intersects I-88 and I-890, the latter of which serves the city's downtown. The highway continues southeast into Albany to a junction with I-87, where I-90 splits from the Thruway, which turns south to serve New York City. I-90 travels east as a toll-free freeway through the northern neighborhoods of Albany and intersects I-787 before it crosses the Hudson River. The freeway travels south around Rensselaer and rejoins the Thruway via the Berkshire Connector, which continues east into the Taconic Mountains toward the Massachusetts state line.

The mileposts and sequential exit numbers on the New York State Thruway mainline originate from New York City, increasing northward on I-87 and westward on I-90;{{cite web |title=Interchange/Exit Listings |url=https://www.thruway.ny.gov/travelers/interchanges/index.html |publisher=New York State Thruway Authority |accessdate=November 30, 2021 |archive-date=September 8, 2021 |archive-url=https://web.archive.org/web/20210908054601/https://www.thruway.ny.gov/travelers/interchanges/index.html |url-status=live }} as a result, the mileposts and exit numbers on I-90 through most of New York run backwards compared to the federal preference for mile-based numbers increasing from west to east.{{cite news |last=Rubel |first=Abigail |date=September 27, 2021 |title=Getting There: Will New York change its highway exit numbers? |url=https://www.timesunion.com/news/article/Getting-There-Will-New-York-change-its-highway-16488756.php |work=Times Union |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201045209/https://www.timesunion.com/news/article/Getting-There-Will-New-York-change-its-highway-16488756.php |url-status=live }} The Berkshire Connector uses west-to-east mileposts and exit numbers with a "B" prefix; the toll-free section of I-90 through Albany and Rensselaer uses conventional west-to-east mileposts and exit numbers despite being geographically north–south. I-90 is currently the only Interstate that has a complete set of nine spur routes within one state, all numbers being used. In addition, I-990, a short spur route near Buffalo that is not directly connected to I-90, is the highest number given to an Interstate.{{cite news |date=May 31, 2006 |title=50 Years of freedom |url=https://www.overdriveonline.com/business/article/14879885/50-years-of-freedom |work=Overdrive |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201045209/https://www.overdriveonline.com/business/article/14879885/50-years-of-freedom |url-status=live }}{{cite web |year=2006 |title=Tennessee's Interstate System – Frequently Asked Questions |url=https://www.tn.gov/tdot/100years-home/100years-interstate/100-years-interstate-system-faqs.html |publisher=Tennessee Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201045209/https://www.tn.gov/tdot/100years-home/100years-interstate/100-years-interstate-system-faqs.html |url-status=live }}

=Massachusetts=

File:Fenway neighborhood seen from Prudential Skywalk.jpg in Boston's Fenway–Kenmore neighborhood, seen from the Prudential Tower. Fenway Park is visible at top left.|alt=Aerial view of a divided highway in a dense urban neighborhood, passing under several bridges and near multi-story buildings and a baseball stadium]]

I-90 in Massachusetts is concurrent with the entirety of the Massachusetts Turnpike (also known as "the Pike" or "MassPike").{{cite map |author=MassDOT Central Transportation Planning Staff |year=2019 |title=Massachusetts Official Transportation Map |scale=1 inch = 6 miles |url=https://www.mass.gov/doc/official-transportation-map-english/download |location=Boston |publisher=Massachusetts Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060239/https://www.mass.gov/doc/official-transportation-map-english/download |url-status=live }} The turnpike begins at the New York state line in West Stockbridge and travels southeast through the Berkshires to the Pioneer Valley.{{cite news |last=Carlinsky |first=Dan |date=September 21, 1975 |title=...And Back Roads Of Massachusetts |at=sec. 10, p. 1 |url=https://www.nytimes.com/1975/09/21/archives/and-back-roads-of-massachusetts-fall-foliage-massachusetts.html |work=The New York Times |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060236/https://www.nytimes.com/1975/09/21/archives/and-back-roads-of-massachusetts-fall-foliage-massachusetts.html |url-status=live }} The highway travels through the northern suburbs of Springfield, where it intersects I-91 and crosses the Connecticut River into Chicopee. I-90 then crosses over I-391 without an interchange and serves as the northern terminus of I-291 on the eastern outskirts of the city. The turnpike continues east through the hills of Central Massachusetts and serves as the eastern terminus of I-84 in the town of Sturbridge.

From Sturbridge, the turnpike travels northeast towards Worcester and passes through the city's southern outskirts. It serves as the respective northern and western terminus of I-395 and I-290 in Auburn, located southwest of Worcester, and continues to an interchange with I-495 near Westborough at the edge of Greater Boston. I-90 travels through the western suburbs of Boston and travels through Framingham before it intersects I-95/Route 128, the main beltway around Boston, on the border of Weston and Newton. The turnpike continues along the Charles River into Boston, where it descends into a tunnel that passes Boston University, Fenway Park, and under the Prudential Tower complex in the Back Bay neighborhood.{{cite news |last=Rubin |first=Eilhu |date=May 27, 2012 |title=How to look at the Prudential |url=https://www.bostonglobe.com/ideas/2012/05/26/how-look-pru/GRnscdL9VQjJQ5AsW6yXML/story.html |work=The Boston Globe |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060237/https://www.bostonglobe.com/ideas/2012/05/26/how-look-pru/GRnscdL9VQjJQ5AsW6yXML/story.html |url-status=live }}

I-90 intersects I-93 on the south side of Downtown Boston and travels under the Fort Point Channel to serve the Seaport District. The turnpike then enters the Ted Williams Tunnel, which travels northeast under Boston Harbor to the passenger terminals at Logan International Airport.{{cite news |last=Flint |first=Anthony |date=December 29, 2015 |title=10 years later, did the Big Dig deliver? |url=https://www.bostonglobe.com/magazine/2015/12/29/years-later-did-big-dig-deliver/tSb8PIMS4QJUETsMpA7SpI/story.html |work=The Boston Globe |accessdate=November 30, 2021 |archive-date=December 5, 2020 |archive-url=https://web.archive.org/web/20201205214626/https://www.bostonglobe.com/magazine/2015/12/29/years-later-did-big-dig-deliver/tSb8PIMS4QJUETsMpA7SpI/story.html |url-status=live }} After it passes the northwest side of the airport, I-90 terminates at an interchange with Route 1A in East Boston. The section between I-93 and the airport was opened in the early 2000s as part of the Big Dig megaproject, which rebuilt several Boston freeways and extended I-90 by {{convert|3.5|mi|km}}.{{cite web |title=The Big Dig: tunnels and bridges |url=https://www.mass.gov/info-details/the-big-dig-tunnels-and-bridges |publisher=Massachusetts Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201060242/https://www.mass.gov/info-details/the-big-dig-tunnels-and-bridges |url-status=live }}

History

=Predecessors and establishment=

An east–west controlled access highway to serve the Northern United States was proposed in the early 20th century in several federal government documents, including reports from the Bureau of Public Roads in the 1930s and 1940s.{{cite news |last=Miller |first=James N. |date=July 23, 1939 |title=14,000 Mile Super Highway To Speed Transportation |page=3 |work=The Seattle Times}}{{cite magazine |last=Pfeiffer |first=David A. |date=Summer 2006 |title=Ike's Interstates at 50 |pages=14–18 |url=https://www.archives.gov/publications/prologue/2006/summer/interstates.html |magazine=Prologue |publisher=National Archives and Records Administration |issn=0033-1031 |oclc=321015582 |accessdate=April 11, 2022 |archive-date=March 2, 2011 |archive-url=https://web.archive.org/web/20110302235254/http://archives.gov/publications/prologue/2006/summer/interstates.html |url-status=live }} The Interstate Highway System was created by the Federal-Aid Highway Act of 1956, which was approved by the U.S. Congress and signed into law on June 26, 1956.{{cite web |last=Weingroff |first=Richard F. |year=2006 |title=Designating the Urban Interstates |url=https://www.fhwa.dot.gov/infrastructure/fairbank.cfm |publisher=Federal Highway Administration |accessdate=November 30, 2021 |archive-date=December 30, 2017 |archive-url=https://web.archive.org/web/20171230231552/https://www.fhwa.dot.gov/infrastructure/fairbank.cfm |url-status=live }} I-90 was assigned to the northernmost transcontinental route in the system by the American Association of State Highway Officials in 1957.{{cite map |author=American Association of State Highway Officials |date=August 14, 1957 |title=Official Route Numbering for the National System of Interstate and Defense Highways |url=https://upload.wikimedia.org/wikipedia/commons/9/9c/Interstate_Highway_plan_August_14%2C_1957.jpg |scale=Scale not given |location=Washington, D.C. |publisher=Public Roads Administration |via=Wikimedia Commons |accessdate=November 30, 2021 |archive-date=May 3, 2021 |archive-url=https://web.archive.org/web/20210503214401/https://upload.wikimedia.org/wikipedia/commons/9/9c/Interstate_Highway_plan_August_14,_1957.jpg |url-status=live }}{{cite news |last=Hodenfield |first=G. K. |date=September 26, 1957 |title=New Markers to Dot Super Roads |page=1 |work=The Indianapolis News |url=https://www.newspapers.com/clip/89671853/new-markers-to-dot-super-roads/ |via=Newspapers.com |accessdate=November 30, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129053729/https://www.newspapers.com/clip/89671853/new-markers-to-dot-super-roads/ |url-status=live }}

The freeway would travel along existing parts of the United States Numbered Highway System, which was established at the suggestion of the federal government in 1926 to replace the named auto trails.{{cite web |last=Weingroff |first=Richard F. |title=From Names to Numbers: The Origins of the U.S. Numbered Highway System |url=https://www.fhwa.dot.gov/infrastructure/numbers.cfm |work=Highway History |publisher=Federal Highway Administration |accessdate=December 9, 2021 |archive-date=September 1, 2019 |archive-url=https://web.archive.org/web/20190901182531/https://www.fhwa.dot.gov/infrastructure/numbers.cfm |url-status=live }} Among these auto trails, which were generally designated by private motorist organizations, were the transcontinental Yellowstone Trail and National Parks Highway, created in the 1910s along the future route of I-90 between Seattle and Boston.{{cite magazine |last=Westgard |first=A. L. |author-link=A. L. Westgard |date=June 7, 1919 |title=Let's Go: Here Are the Motor Trails from Atlantic to Pacific—and All Points Between |pages=360–361, 379 |magazine=The Independent |volume=98 |issue=3678 |oclc=4927591 |url=https://books.google.com/books?id=LvDlAAAAMAAJ&pg=PA360 |via=Google Books |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233351/https://books.google.com/books?id=LvDlAAAAMAAJ&pg=PA360 |url-status=live }}{{cite news |last=Burkhart |first=Dan |date=February 17, 1998 |title=Interstate 90 had rough, rutted forerunner |page=8M |work=Great Falls Tribune |url=https://www.newspapers.com/clip/90281383/interstate-90-had-rough-rutted/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209081242/https://www.newspapers.com/clip/90281383/interstate-90-had-rough-rutted/ |url-status=live }} The national numbered highways along the corridor included US 10 from Seattle to Billings, Montana; US 87 from Billings to Buffalo, Wyoming; US 16 from Buffalo to Portage, Wisconsin; US 51 from Portage to Rockford, Illinois and US 20 from Rockford to Boston.{{cite book |author=Joint Board on Interstate Highways |year=1925 |title=Report of Joint Board on Interstate Highways, October 30, 1925, Approved by the Secretary of Agriculture, November 18, 1925 |chapter=Appendix VI: Descriptions of the Interstate Routes Selected, with Numbers Assigned |pages=50–56 |chapter-url=https://en.wikisource.org/wiki/Report_of_Joint_Board_on_Interstate_Highways_October_30,_1925#48 |location=Washington, D.C. |publisher=United States Department of Agriculture |id={{OCLC|733875457|55123355|71026428}} |via=Wikisource |accessdate=December 9, 2021 |archive-date=November 14, 2017 |archive-url=https://web.archive.org/web/20171114145350/https://en.wikisource.org/wiki/Report_of_Joint_Board_on_Interstate_Highways_October_30,_1925#48 |url-status=live }}{{cite map |author1= Bureau of Public Roads |author2= American Association of State Highway Officials |date= November 11, 1926 |title= United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials |url= https://commons.wikimedia.org/wiki/File:United_States_System_of_Highways_Adopted_for_Uniform_Marking_by_the_American_Association_of_State_Highway_Officials.jpg |scale= 1:7,000,000 |location= Washington, DC |publisher= United States Geological Survey |oclc= 32889555 |via= Wikimedia Commons |accessdate= December 9, 2021 |archive-date= April 13, 2017 |archive-url= https://web.archive.org/web/20170413153913/https://commons.wikimedia.org/wiki/File:United_States_System_of_Highways_Adopted_for_Uniform_Marking_by_the_American_Association_of_State_Highway_Officials.jpg |url-status= live }}

=Tollways and urban construction=

File:Chicago Circle Interchange 2018.jpg in Chicago during reconstruction in 2018|alt=Aerial view of a major freeway interchange with several flyover ramps set within an urban neighborhood. Several ramps have exposed steel beams and other unfinished surfaces, showing signs of construction activity.]]

Major portions of I-90 in the Midwest and Northeastern states used existing toll roads built by state governments in the 1950s and 1960s. The Northwest Tollway, Chicago Skyway, Indiana Toll Road, Ohio Turnpike, New York State Thruway, and Massachusetts Turnpike all predate I-90 and were incorporated into the route.{{cite news |last=Ingraham |first=Joseph C. |date=May 24, 1959 |title=Boston to Chicago: New Section of Thruway Completes Express Route Between Cities |page=XX1 |url=https://www.nytimes.com/1959/05/24/archives/boston-to-chicago-new-section-of-thruway-completes-express-route.html |work=The New York Times |accessdate=December 4, 2021 |archive-date=July 22, 2018 |archive-url=https://web.archive.org/web/20180722095852/https://www.nytimes.com/1959/05/24/archives/boston-to-chicago-new-section-of-thruway-completes-express-route.html |url-status=live }} This also meant that portions of the route did not adhere to Interstate Highway standards, but they were either deemed adequate or rebuilt to conform by the 1980s.{{cite news |last=Gough |first=William |date=September 30, 1987 |title=Across the lake in concrete: A ride on new I-90 span bridges a gap in the imagination |page=E1 |work=The Seattle Times}} The Pennsylvania section was planned in the early 1950s as the "Erie Extension" of the Pennsylvania Turnpike,{{cite news |last=Snyder |first=Thomas P. |date=September 7, 1953 |title=Turnpike Link to Erie Assured, Survey of Best Route Begins |page=8 |work=Pittsburgh Sun-Telegraph |url=https://www.newspapers.com/clip/89848370/turnpike-link-to-erie-assured-survey/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233351/https://www.newspapers.com/clip/89848370/turnpike-link-to-erie-assured-survey/ |url-status=live }} but was instead completed as a toll-free road in October 1960 with federal funds.{{cite news |date=October 24, 1960 |title=Erie Throughway Is Scheduled To Be Officially Open Friday |page=3 |work=The Titusville Herald |url=https://www.newspapers.com/clip/89848487/erie-throughway-is-scheduled-to-be/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201084457/https://www.newspapers.com/clip/89848487/erie-throughway-is-scheduled-to-be/ |url-status=live }} The completion of the section also allowed for full use of the New York State Thruway, which had been finished three years earlier but ended abruptly at the state line.{{cite news |last=White |first=William A. |date=October 28, 1960 |title='Dead-End' Thruway Is Opened At Erie |page=4 |work=The Pittsburgh Press |url=https://www.newspapers.com/clip/89848466/dead-end-thruway-is-opened-at-erie/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201084456/https://www.newspapers.com/clip/89848466/dead-end-thruway-is-opened-at-erie/ |url-status=live }}

I-90 would use several expressways and tollways in the Chicago area, the earliest of which was the Tri-State Expressway (now the Kingery Expressway), completed in 1950 and extended into Indiana the following year.{{cite news |last=Foust |first=Hal |date=October 23, 1950 |title=First Section of Expressway Will Open Nov. 1 |at=sec. 1, p. 14 |work=Chicago Tribune |url=https://www.newspapers.com/clip/90008367/first-section-of-expressway-will-open/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.newspapers.com/clip/90008367/first-section-of-expressway-will-open/ |url-status=live }}{{cite news |date=December 14, 1951 |title=Schricker, Stevenson Open Super-Highway Link |page=1 |work=The Hammond Times |url=https://www.newspapers.com/clip/90008620/schricker-stevenson-open-super-highway/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204085252/https://www.newspapers.com/clip/90008620/schricker-stevenson-open-super-highway/ |url-status=live }} It was followed by the Congress Expressway in the western suburbs, first opened in 1955, and the Northwest Tollway in 1958.{{cite news |last=Foust |first=Hal |date=December 10, 1955 |title=Show 4.5 Mile Congress St. Stretch to Be Opened to Traffic Tuesday |at=sec. 1, p. 3 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89957155/show-45-mile-congress-st-stretch-to/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.newspapers.com/clip/89957155/show-45-mile-congress-st-stretch-to/ |url-status=live }}{{cite news |date=August 21, 1958 |title=Traffic Rolls on 76 Miles of Tollways |at=sec. 1, p. 1 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89957220/traffic-rolls-on-76-miles-of-tollways/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203112636/https://www.newspapers.com/clip/89957220/traffic-rolls-on-76-miles-of-tollways/ |url-status=live }} The last section to be completed in Illinois was the toll-free Dan Ryan Expressway, which opened on December 15, 1962, and was described as the "world's widest freeway" at the time.{{cite news |last=Foust |first=Hal |date=December 16, 1962 |title=Drivers Jam Expressway on First Day |at=sec. 1, p. 1 |work=Chicago Tribune |url=https://www.newspapers.com/clip/90283091/drivers-jam-expressway-on-first-day/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209105701/https://www.newspapers.com/clip/90283091/drivers-jam-expressway-on-first-day/ |url-status=live }}{{cite news |last=Sullivan |first=Mort J. |date=December 13, 1962 |title=Dan Ryan Expressway Will Open Saturday |page=24 |work=Chicago Daily Herald |agency=United Press International |url=https://www.newspapers.com/clip/90283107/dan-ryan-expressway-will-open-saturday/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209105659/https://www.newspapers.com/clip/90283107/dan-ryan-expressway-will-open-saturday/ |url-status=live }} In 1965, the designation for I-90 was switched with I-94 south of Chicago, which moved it to the tolled Chicago Skyway (completed in 1958);{{cite map |author=Rand McNally |year=1965 |title=1965 Illinois Official Highway Map |scale=1 inch = 12 miles |location=Springfield |publisher=Illinois Division of Highways |url=https://apps.dot.illinois.gov/HistoricalMapViewer/Files/1965F_Illinois_Statemap.pdf |at=[https://apps.dot.illinois.gov/HistoricalMapViewer/Files/1965B_Illinois_Statemap.pdf Chicago and Vicinity] inset |access-date=December 9, 2021 |archive-date=November 7, 2021 |archive-url=https://web.archive.org/web/20211107232920/https://apps.dot.illinois.gov/HistoricalMapViewer/Files/1965F_Illinois_Statemap.pdf |url-status=live }}{{cite news |last=Foust |first=Hal |date=April 17, 1958 |title=A Great Day For Chicago! Skyway Open |at=sec. 1, p. 1 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89957115/a-great-day-for-chicago-skyway-open/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233351/https://www.newspapers.com/clip/89957115/a-great-day-for-chicago-skyway-open/ |url-status=live }} the change was requested by the Illinois and Indiana state governments to avoid confusion and provide a continuous toll connection to the Indiana Toll Road,{{cite web |date=February 27, 1964 |title=An Application From the State Highway Department of Indiana For the Relocation of Interstate Route I-90 |publisher=American Association of State Highway Officials |url=https://grmservices.grmims.com/vsearch/portal/public/na4/aashto/default |via=AASHTO Route Numbering Archive |accessdate=December 9, 2021 |archive-date=October 2, 2020 |archive-url=https://web.archive.org/web/20201002030140/https://grmservices.grmims.com/vsearch/portal/public/na4/aashto/default |url-status=live }} which had been fully opened in 1956.{{cite news |date=November 16, 1956 |title=No Fanfare As Final Indiana Toll Link Opens; Semi-Trailer, State Police Car 1st Customers |page=1 |work=The Hammond Times |url=https://www.newspapers.com/clip/90008489/no-fanfare-as-final-indiana-toll-link/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204085317/https://www.newspapers.com/clip/90008489/no-fanfare-as-final-indiana-toll-link/ |url-status=live }} I-90 was moved onto the Kennedy Expressway in 1977 and its western route was replaced with I-290 from Schaumburg to the Circle Interchange in Chicago.{{AASHTO minutes |year=1977S |page=5 |accessdate=December 9, 2021}}{{Illinois road map |year=1979 |inset=Chicago and Vicinity |accessdate=April 11, 2022}}

The other tolled sections of I-90 were completed in the 1950s by their respective state governments. The {{convert|241|mi|km|adj=mid}} Ohio Turnpike opened to traffic on October 1, 1955, three years after construction began.{{cite news |last=Cram |first=Winston |date=October 1, 1955 |title=Midnight Ceremony Opens Turnpike; Traffic Swarms On Ohio 'Main Street' |page=1 |work=Toledo Blade |url=https://news.google.com/newspapers?id=IvZOAAAAIBAJ&sjid=jwAEAAAAIBAJ&pg=6946%2C3406428 |via=Google News Archive |accessdate=December 9, 2021 |archive-date=December 9, 2021 |archive-url=https://web.archive.org/web/20211209113044/https://news.google.com/newspapers?id=IvZOAAAAIBAJ&sjid=jwAEAAAAIBAJ&pg=6946,3406428 |url-status=live }} The first segment of the New York Thruway opened in June 1954 and was followed by extensions to Buffalo and the Albany area by the end of the year.{{cite news |last=Ingraham |first=Joseph C. |date=June 23, 1954 |title=Thruway to Open Officially Today |page=29 |url=https://www.nytimes.com/1954/06/24/archives/thruway-to-open-officially-today-dewey-will-cut-tape-on-first-toll.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.nytimes.com/1954/06/24/archives/thruway-to-open-officially-today-dewey-will-cut-tape-on-first-toll.html |url-status=live }}{{cite news |last=Ingraham |first=Joseph C. |date=October 24, 1954 |title=More Thruway: Newburgh-Utica Link Opens Tuesday, Bringing Pike Within 61 Miles of City |page=X19 |url=https://www.nytimes.com/1954/10/24/archives/more-thruway-newburghutica-link-opens-tuesday-bringing-pike-within.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204103347/https://www.nytimes.com/1954/10/24/archives/more-thruway-newburghutica-link-opens-tuesday-bringing-pike-within.html |url-status=live }} It was extended to the Pennsylvania state line in 1957 and to the Massachusetts Turnpike via the Berkshire Connector in 1959.{{cite news |date=December 15, 1957 |title=The Thruway Becomes the Longest Toll Road |page=159 |url=https://www.nytimes.com/1957/12/15/archives/the-thruway-becomes-the-longest-toll-road-on-schedule.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.nytimes.com/1957/12/15/archives/the-thruway-becomes-the-longest-toll-road-on-schedule.html |url-status=live }}{{cite news |last=Weaver |first=Warren Jr. |date=May 27, 1959 |title=Thruway Opened to New England |page=20 |url=https://www.nytimes.com/1959/05/27/archives/thruway-opened-to-new-england-governor-rides-half-moon-in-symbolic.html |work=The New York Times |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204103847/https://www.nytimes.com/1959/05/27/archives/thruway-opened-to-new-england-governor-rides-half-moon-in-symbolic.html |url-status=live }} The Berkshire section linked with the Massachusetts Turnpike, which had opened in 1957 from the state line to Newton, a distance of {{convert|123|mi|km}}.{{cite news |last=Ingraham |first=Joseph C. |date=May 12, 1957 |title=Bay State's Turnpike Link |page=XX3 |url=https://www.nytimes.com/1957/05/12/archives/bay-states-turnpike-link-opening-of-massachusetts-highway-this-week.html |work=The New York Times |accessdate=December 4, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233352/https://www.nytimes.com/1957/05/12/archives/bay-states-turnpike-link-opening-of-massachusetts-highway-this-week.html |url-status=live }} The turnpike was extended into Boston in two stages: first by {{convert|9|mi|km}} from Newton to Allston in September 1964;{{cite news |last=Plotkin |first=A. S. |date=September 4, 1964 |title=Hot Debate Preceded Building of Toll Link |page=12 |work=The Boston Globe |url=https://www.newspapers.com/clip/90009720/hot-debate-preceded-building-of-toll/ |via=Newspapers.com |accessdate=December 4, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204110924/https://www.newspapers.com/clip/90009720/hot-debate-preceded-building-of-toll/ |url-status=live }} and finally with an extension to I-93 near South Station in Downtown Boston that opened on February 18, 1965.{{cite news |last=Hanron |first=Robert B. |date=February 19, 1965 |title=East-West Gateway Swings Open; 60 M.P.H. Through Boston... |page=1 |work=The Boston Globe |url=https://www.newspapers.com/clip/90009765/east-west-gateway-swings-open/ |via=Newspapers.com |accessdate=December 4, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204110924/https://www.newspapers.com/clip/90009765/east-west-gateway-swings-open/ |url-status=live }}

=Non-tolled construction=

File:I 90 Montana Construction sign.png

The freeway also incorporated other non-tolled expressway bypasses planned by state governments in the early 1950s and modified to meet Interstate standards. A bypass of Spokane Valley, Washington, opened in November 1956 as the first section in Washington and was extended into neighboring Spokane two years later.{{cite news |last=Dieffenbach |first=Al |date=November 16, 1961 |title=Freeway is Five: Traffic Benefits Are Listed |page=1 |work=Spokane Daily Chronicle |url=https://www.newspapers.com/clip/89848854/freeway-is-five-traffic-benefits-are/ |via=Newspapers.com |access-date=December 9, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201094407/https://www.newspapers.com/clip/89848854/freeway-is-five-traffic-benefits-are/ |url-status=live }} Wisconsin opened their first section in November 1959, connecting the terminus of the Illinois Tollway with Janesville,{{cite news |last=Foust |first=Hal |date=November 25, 1959 |title=Opens 18 Miles of Interstate Expressway |at=sec. 1, p. 8 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89956670/opens-18-miles-of-interstate-expressway/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203102613/https://www.newspapers.com/clip/89956670/opens-18-miles-of-interstate-expressway/ |url-status=live }} and extended the freeway through the Madison area to Wisconsin Dells in 1962.{{cite news |last=Foust |first=Hal |date=November 3, 1962 |title=Expressway From Chicago to Dells Open |at=sec. 1, p. 16 |work=Chicago Tribune |url=https://www.newspapers.com/clip/89956704/expressway-from-chicago-to-dells-open/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203102847/https://www.newspapers.com/clip/89956704/expressway-from-chicago-to-dells-open/ |url-status=live }} The Cleveland Innerbelt opened in stages from 1959 to 1962 and was originally planned to connect with the Parma Freeway, which would have carried I-90 around the northwest side of Downtown Cleveland. It was later cancelled in the 1960s amid public opposition.{{cite encyclopedia |date=May 11, 2018 |title=Innerbelt Freeway |url=https://case.edu/ech/articles/i/innerbelt-freeway |encyclopedia=Encyclopedia of Cleveland History |publisher=Case Western Reserve University |accessdate=December 9, 2021 |archive-date=December 4, 2021 |archive-url=https://web.archive.org/web/20211204093234/https://case.edu/ech/articles/i/innerbelt-freeway |url-status=live }}{{cite news |last=Grant |first=Alison |date=May 6, 2015 |title=Big Creek bike-pedestrian greenway eyed for vicinity of abandoned 'Parma Freeway' |url=https://www.cleveland.com/metro/2015/05/big_creek_bike-pedestrian_gree.html |work=The Plain Dealer |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210033137/https://www.cleveland.com/metro/2015/05/big_creek_bike-pedestrian_gree.html |url-status=live }} The first Minnesota section, built to bypass Austin, began construction in 1957 and opened in 1961.{{cite news |date=October 2, 1957 |title=Road Construction Near Austin Part of East-West Belt Route |page=6B |work=The Minneapolis Star |url=https://www.newspapers.com/clip/90281922/road-construction-near-austin-part-of/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233353/https://www.newspapers.com/clip/90281922/road-construction-near-austin-part-of/ |url-status=live }}{{cite news |date=November 9, 1961 |title=Beltline at Austin Opened |page=10 |work=Winona Daily News |agency=Associated Press |url=https://www.newspapers.com/clip/89956300/beltline-at-austin-opened/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203092821/https://www.newspapers.com/clip/89956300/beltline-at-austin-opened/ |url-status=live }}

Wisconsin was among the first states to complete its rural Interstate system and opened its final section of I-90, from La Crosse to Tomah, in November 1969.{{cite news |date=October 22, 2009 |title=I-94 segment observes 50th anniversary |url=https://www.republicaneagle.com/news/i-94-segment-observes-50th-anniversary/article_c2b87d1b-b474-5d7c-b857-88f4ca6455ac.html |work=Red Wing Republican Eagle |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233353/https://www.republicaneagle.com/news/i-94-segment-observes-50th-anniversary/article_c2b87d1b-b474-5d7c-b857-88f4ca6455ac.html |url-status=live }}{{cite news |last=Wolski |first=Wayne |date=November 4, 1969 |title=I-90 Rites Open 4-Laner To Area |page=1 |work=La Crosse Tribune |url=https://www.newspapers.com/clip/89956768/i-90-rites-open-4-laner-to-area/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203102938/https://www.newspapers.com/clip/89956768/i-90-rites-open-4-laner-to-area/ |url-status=live }} The section around Albany, New York, built as a toll-free alternative to the New York Thruway, was completed in 1976 with a connection to the Berkshire Connector, which had been originally intended to carry the I-90 designation across the Hudson River.{{cite web |year=1977 |title=New York State Department of Transportation Annual Report, 1976 |page=7 |url=https://nysl.ptfs.com/data/Library1/Library1/pdf/1760149_1976.pdf |publisher=New York State Department of Transportation |via=New York State Library |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233354/https://nysl.ptfs.com/aw-server/rest/product/purl/NYSL/s/ba9fa552-d3d2-4ebe-889d-367b1a1adfbb |url-status=live }}{{cite news |last=O'Brien |first=Tim |date=March 25, 2010 |title=Thruway connector's name spurs question |url=http://blog.timesunion.com/gettingthere/thruway-connectors-name-spurs-question/697/ |work=Times Union |url-status=dead |archive-url=https://web.archive.org/web/20160213195904/http://blog.timesunion.com/gettingthere/thruway-connectors-name-spurs-question/697/ |archive-date=February 13, 2016 |accessdate=December 9, 2021}} South Dakota completed its final section in November 1976, which created an unbroken stretch of four-lane highway from the Wyoming state line to Boston but some intersections remained.{{cite news |date=November 19, 1976 |title=I-90 ceremony to be held near Spearfish |page=5 |work=Mitchell Daily Republic |url=https://www.newspapers.com/clip/89956130/i-90-ceremony-to-be-held-near-spearfish/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203092825/https://www.newspapers.com/clip/89956130/i-90-ceremony-to-be-held-near-spearfish/ |url-status=live }} The Minnesota segment of I-90 was declared complete in September 1978 with a dedication at Blue Earth, where a golden line was painted to emulate the golden spike of the first transcontinental railroad.{{cite news |last=Coleman |first=Nick |date=September 24, 1978 |title=Blue Earth puts Golden Spike in Interstate 90 |pages=[https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ 1A], [https://www.newspapers.com/clip/89956211/blue-earth-puts-golden-spike-in/ 16A] |work=Minneapolis Tribune |url=https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 3, 2021 |archive-url=https://web.archive.org/web/20211203092818/https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ |url-status=live }} Two months later, Ohio finished its last section west of Cleveland.{{cite news |last=Hosie |first=Ron |date=November 4, 1978 |title=Heckler draws retort from Rhodes |page=3 |work=Dayton Daily News |url=https://www.newspapers.com/clip/90008915/heckler-draws-retort-from-rhodes/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233912/https://www.newspapers.com/clip/90008915/heckler-draws-retort-from-rhodes/ |url-status=live }}

The western states were the last to complete their segments of I-90. Wyoming opened its final section, from the Montana state line to Sheridan, in July 1985 and dedicated it three months later following the completion of Montana's cross-border section.{{cite news |last=Thackeray |first=Lorna |date=October 10, 1985 |title=Governors plan Interstate 90 christening |page=2B |work=The Billings Gazette |url=https://www.newspapers.com/clip/90333934/governors-plan-interstate-90-christening/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210064837/https://www.newspapers.com/clip/90333934/governors-plan-interstate-90-christening/ |url-status=live }} The last two-lane section in Montana, near Springdale, was widened to four lanes in May 1987.{{cite news |date=May 14, 1987 |title=I-90 finally done |page=9A |work=Great Falls Tribune |agency=Associated Press |url=https://www.newspapers.com/clip/89956022/i-90-finally-done/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233910/https://www.newspapers.com/clip/89956022/i-90-finally-done/ |url-status=live }} One of the last rural sections of I-90 to be built was through Wallace, Idaho, which placed its downtown on the National Register of Historic Places in 1976 to prevent its demolition for the freeway. The {{convert|1.5|mi|km|adj=mid}} elevated freeway bypassed Wallace to the north and cost $42 million (equivalent to ${{Inflation|US-GDP|42|1991}} million in {{Inflation-year|US-GDP}} dollars){{inflation-fn|US-GDP}} to construct. It opened on September 5, 1991, and the city ceremonially retired the last stoplight on I-90 a week later.{{cite news |last=Devlin |first=Sherry |date=September 8, 1991 |title=No Stopping Now |page=E1 |work=The Missoulian |url=https://www.newspapers.com/clip/90334418/no-stopping-now/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210064843/https://www.newspapers.com/clip/90334418/no-stopping-now/ |url-status=live }}{{cite news |last=Free |first=Cathy |date=September 15, 1991 |title=Engineer pleased with his Wallace freeway 'work of art' |page=B3 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/89735440/engineer-pleased-with-his-wallace/ |via=Newspapers.com |accessdate=November 28, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233910/https://www.newspapers.com/clip/89735440/engineer-pleased-with-his-wallace/ |url-status=live }} The Idaho section was declared fully complete in July 1992 after the Veterans Memorial Centennial Bridge opened near Coeur d'Alene.{{cite news |last=Foster |first=J. Todd |date=July 4, 1992 |title=New I-90 stretch offers scenery, safety |page=A1 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/84197254/new-i-90-stretch-offers-scenery-safety/ |via=Newspapers.com |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210064835/https://www.newspapers.com/clip/84197254/new-i-90-stretch-offers-scenery-safety/ |url-status=live }}

=Completion and later projects=

File:Interstate 90 floating bridges after Blue Angels performance - 01.jpg (left) and Lacey V. Murrow (right) floating bridges carry I-90 across Lake Washington from Seattle to Mercer Island.|alt=View of two bridges carrying a divided highway over a lake with light traffic]]

Washington was the last state to complete its section of I-90, primarily due to disputes and litigation over the Seattle–Bellevue section. The Snoqualmie Pass section was completed in 1981 with a viaduct for westbound traffic that stands {{convert|150|ft|m}} over Denny Creek.{{cite news |last=O'Ryan |first=John |date=December 4, 1981 |title=Cars whiz along on feared bridge |page=C1 |work=Seattle Post-Intelligencer}} The viaduct replaced an earlier plan for a ground-level freeway at the behest of environmentalists; the Mountains to Sound Greenway was established in 1990 along the corridor between Seattle and Thorp to preserve wilderness and recreational areas and was designated as a National Scenic Byway in 1998, a first for an Interstate Highway.{{cite news |last=Senos |first=Rene |date=April 18, 2002 |title=Blending scenery and ecology |url=https://www.djc.com/news/en/11132529.html |work=Seattle Daily Journal of Commerce |accessdate=December 1, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233921/https://www.djc.com/news/en/11132529.html |url-status=live }}{{cite web |last=Ott |first=Jennifer |date=May 18, 2021 |title=Mountains to Sound Greenway Trust |url=https://www.historylink.org/File/21231 |work=HistoryLink |accessdate=December 1, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009233856/https://www.historylink.org/File/21231 |url-status=live }} The extension into Seattle was completed in stages between 1989 and 1993 and cost $1.56 billion (equivalent to ${{format price|{{Inflation|US-GDP|1560000000|1993}}}} in {{Inflation-year|US-GDP}} dollars){{inflation-fn|US-GDP}} to construct.{{cite news |last=Cabrera |first=Luis |date=September 11, 1993 |title=Floating bridge finishes interstate |page=5A |work=Detroit Free Press |agency=Associated Press |url=https://www.newspapers.com/clip/22449728/floating_bridge_finishes_interstate/ |via=Newspapers.com |access-date=August 2, 2018 |archive-url=https://web.archive.org/web/20180803074519/https://www.newspapers.com/clip/22449728/floating_bridge_finishes_interstate/ |archive-date=August 3, 2018 |url-status=live }} The project involved construction of a new floating bridge, expansion of the Mount Baker Ridge Tunnel, addition of lids with parks, and extensive mitigation for environmental and social impacts.{{cite news |last=Corr |first=O. Casey |date=June 2, 1989 |title=The road to recovery—new homes, new park |page=A1 |work=Seattle Post-Intelligencer}} The project was originally planned to be completed in 1992, but was delayed a year due to the sinking of the original floating bridge during renovations in November 1990; the bridge was rebuilt and opened for eastbound traffic on September 12, 1993.{{cite news |last=Gough |first=William |date=June 22, 1989 |title=That'll be one bridge—to go |page=A1 |work=The Seattle Times}}

Extensions at both termini of I-90 were completed in the early 2000s as part of separate projects. The west end at Washington State Route 519 in Seattle was rebuilt as a series of ramps near Safeco Field (now T-Mobile Park) to replace an existing intersection.{{cite news |last=Lindblom |first=Mike |date=May 29, 2003 |title=Some I-90 drivers get turned around |page=A1 |work=The Seattle Times}} A component of the Big Dig megaproject in Boston that extended I-90 east by {{convert|3.5|mi|km}} under Fort Point Channel and Boston Harbor to Logan International Airport opened on January 18, 2003, at a cost of $6.5 billion (equivalent to ${{format price|{{Inflation|US-GDP|6500000000|2003}}}} in {{Inflation-year|US-GDP}} dollars).{{inflation-fn|US-GDP}}{{cite news |last=Lewis |first=Raphael |date=January 18, 2003 |title=Pike tunnel finished, and new era begins |page=A1 |work=The Boston Globe |url=http://www.boston.com/dailyglobe2/018/metro/Pike_tunnel_finished_and_new_era_begins+.shtml |url-status=dead |archive-url=https://web.archive.org/web/20030124144148/http://www.boston.com/dailyglobe2/018/metro/Pike_tunnel_finished_and_new_era_begins+.shtml |archive-date=January 24, 2003 |accessdate=December 9, 2021}} The Fort Point Channel tunnel later closed in July 2006 due to a ceiling panel collapse that killed one person. It reopened in January 2007 after repairs and retrofit work.{{cite news |last=Jefferson |first=Brandie M. |date=January 14, 2007 |title=Traffic begins flowing through Big Dig tunnel where woman died |url=http://archive.boston.com/news/local/massachusetts/articles/2007/01/14/traffic_begins_flowing_through_big_dig_tunnel_where_woman_died/ |work=The Boston Globe |agency=Associated Press |accessdate=December 9, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210073558/http://archive.boston.com/news/local/massachusetts/articles/2007/01/14/traffic_begins_flowing_through_big_dig_tunnel_where_woman_died/ |url-status=live }}

Other sections of I-90 have been rebuilt or replaced to accommodate modern needs and meet updated safety standards. The {{convert|11|mi|km|adj=mid}} Dan Ryan Expressway in Chicago was reconstructed over a two-year period from 2006 to 2007 at a cost of $975 million (equivalent to ${{format price|{{Inflation|US-GDP|975000000|2007}}}} in {{Inflation-year|US-GDP}} dollars),{{inflation-fn|US-GDP}} adding auxiliary lanes and improved bridges. The section carried over 300,000 daily vehicles prior to the project.{{cite news |last=Haggerty |first=Ryan |date=October 26, 2007 |title=All lanes will be open on the Dan Ryan |at=sec. 2, p. 2 |url=http://www.chicagotribune.com/news/local/chi-danryan_weboct26,0,7051621.story |work=Chicago Tribune |url-status=dead |archive-url=https://web.archive.org/web/20071227191626/http://www.chicagotribune.com/news/local/chi-danryan_weboct26,0,7051621.story |archive-date=December 27, 2007 |accessdate=December 10, 2021}} Cleveland's Innerbelt Bridge, which carried I-90 over the Cuyahoga River, was replaced with the George V. Voinovich Bridges, which opened in November 2013 for westbound traffic and September 2016 for eastbound traffic.{{cite news |last=Christ |first=Ginger |date=September 14, 2016 |title=Second George V. Voinovich Bridge (Inner Belt Bridge) opens to traffic Sept. 25 |url=https://www.cleveland.com/metro/2016/09/george_v_voinovich_bridge_inne.html |work=The Plain Dealer |accessdate=December 10, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210080002/https://www.cleveland.com/metro/2016/09/george_v_voinovich_bridge_inne.html |url-status=live }} The old bridge was imploded with explosives on July 12, 2014, and dismantled by the end of the year.{{cite news |last=Grant |first=Alison |date=July 12, 2014 |title=55-year-old Inner Belt Bridge vanishes in a half second |url=https://www.cleveland.com/metro/2014/07/55-year-old_inner_belt_bridge.html |work=The Plain Dealer |accessdate=December 10, 2021 |archive-date=December 10, 2021 |archive-url=https://web.archive.org/web/20211210080003/https://www.cleveland.com/metro/2014/07/55-year-old_inner_belt_bridge.html |url-status=live }} The states of Minnesota and Wisconsin replaced the Dresbach Bridge over the Mississippi River in 2016; the project was spearheaded by Minnesota following the I-35W Mississippi River bridge collapse in 2007.

Names and designations

File:AMVETS memorial sign on Thruway.jpg

I-90 carries several commemorative names designated by state governments, some of which are shared between multiple states. Washington and Minnesota designated their sections as the "American Veterans Memorial Highway".{{cite web |year=1991 |title=RCW 47.17.140: State route No. 90—American Veterans Memorial Highway—Washington green highway. |url=https://app.leg.wa.gov/rcw/default.aspx?cite=47.17.140 |work=Revised Code of Washington |publisher=Washington State Legislature |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082244/https://app.leg.wa.gov/rcw/default.aspx?cite=47.17.140 |url-status=live }}{{cite map |author=MnDOT Office of Transportation System Management |date=October 17, 2019 |title=Memorial Highways & Bridges |url=https://www.dot.state.mn.us/maps/gdma/data/maps/memorial_routes.pdf |scale=Scale not given |location=St. Paul |publisher=Minnesota Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201051409/https://www.dot.state.mn.us/maps/gdma/data/maps/memorial_routes.pdf |url-status=live }} In the states of Idaho,{{cite web |title=Idaho Statues 40-513C: Designation of Purple Heart Trail |year=2008 |url=https://legislature.idaho.gov/statutesrules/idstat/title40/t40ch5/sect40-513c/ |publisher=Idaho Legislature |access-date=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082242/https://legislature.idaho.gov/statutesrules/idstat/title40/t40ch5/sect40-513c/ |url-status=live }} Montana,{{cite web |title=§ 60-1-210: Purple Heart Trail |url=https://leg.mt.gov/bills/2014/mca/60/1/60-1-210.htm |work=Montana Code Annotated 2014 |publisher=Montana Legislature |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201080644/https://leg.mt.gov/bills/2014/mca/60/1/60-1-210.htm |url-status=live }} and South Dakota, I-90 is part of the Purple Heart Trail, which honors Purple Heart recipients.{{cite news |date=August 5, 2012 |title=Interstate 90 dedication set for 'Purple Heart Trail' |url=https://rapidcityjournal.com/news/local/communities/belle_fourche/interstate-90-dedication-set-for-purple-heart-trail/article_d13c6de5-a088-5057-974f-a7ee0b5fe60f.html |work=Rapid City Journal |url-access=subscription |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082244/https://rapidcityjournal.com/news/local/communities/belle_fourche/interstate-90-dedication-set-for-purple-heart-trail/article_d13c6de5-a088-5057-974f-a7ee0b5fe60f.html |url-status=live }} In Wisconsin, I-90 and I-94 were designated as the Wisconsin Veterans Memorial Highway in 1987.{{cite web |title=Commemorative highways and bridges |url=https://wisconsindot.gov/pages/travel/road/comm-hwys/default.aspx |publisher=Wisconsin Department of Transportation |accessdate=November 30, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201051409/https://wisconsindot.gov/pages/travel/road/comm-hwys/default.aspx |url-status=live }} From Lorain, Ohio,{{cite web |date=August 4, 1978 |title=Ohio Revised Code Section 5533.35: Amvets highway |url=https://codes.ohio.gov/assets/laws/revised-code/authenticated/55/5533/5533.35/8-4-1978/5533.35-8-4-1978.pdf |work=Ohio Revised Code |publisher=Ohio General Assembly |accessdate=December 1, 2021 |archive-date=November 30, 2021 |archive-url=https://web.archive.org/web/20211130181321/https://codes.ohio.gov/assets/laws/revised-code/authenticated/55/5533/5533.35/8-4-1978/5533.35-8-4-1978.pdf |url-status=live }} through Pennsylvania and New York, I-90 is officially designated as the "AMVETS Memorial Highway".{{cite web |date=July 11, 1990 |title=P.L. 453, No. 110: AMVETS Memorial Highway – Designation |url=https://www.legis.state.pa.us/cfdocs/legis/li/uconsCheck.cfm?yr=1990&sessInd=0&act=110 |work=Pennsylvania Unconsolidated Statutes |publisher=Pennsylvania General Assembly |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082246/https://www.legis.state.pa.us/cfdocs/legis/li/uconsCheck.cfm?yr=1990&sessInd=0&act=110 |url-status=live }}{{cite news |date=May 9, 1991 |title=Thruway Ceremony Planned for May 17 |page=10 |work=Hamburg Sun |url=https://www.newspapers.com/clip/89848246/thruway-ceremony-planned-for-may-17/ |via=Newspapers.com |accessdate=December 1, 2021 |archive-date=December 1, 2021 |archive-url=https://web.archive.org/web/20211201082241/https://www.newspapers.com/clip/89848246/thruway-ceremony-planned-for-may-17/ |url-status=live }}

Major intersections

;Washington

: {{jct|state=WA|SR|519}} in downtown Seattle

: {{jct|country=USA|I|5}} in downtown Seattle

: {{jct|country=USA|I|405|dab1=Washington}} in Bellevue near Seattle

: {{jct|country=USA|I|82|US|97}} in Ellensburg

: {{jct|country=USA|US|395}} in Ritzville; joined for {{convert|61|mi|km}} until Spokane

: {{jct|country=USA|US|2|US|395}} in Spokane; joined for {{convert|4|mi|km}}

;Idaho{{cite map |year=2021 |title=Idaho Official State Highway Map |scale=1:1,248,000 |url=https://visitidaho.org/content/uploads/2021/05/Idaho_Highway_Map.pdf |location=Boise |publisher=Idaho Transportation Department |accessdate=April 11, 2022 |archive-date=April 18, 2022 |archive-url=https://web.archive.org/web/20220418193832/https://visitidaho.org/content/uploads/2021/05/ITC_HighwayMap-2021.pdf |url-status=live }}

: {{jct|country=USA|US|95}} in Coeur d'Alene

;Montana

: {{jct|country=USA|US|93}} near Missoula; joined for {{convert|5|mi|km}}

: {{jct|country=USA|US|12}} in Missoula; joined for {{convert|69|mi|km}} until Garrison

: {{jct|country=USA|I|15}} near Butte; joined for {{convert|8|mi|km}} through Butte

: {{jct|country=USA|I|115}} in Butte

: {{jct|country=USA|US|191}} in Bozeman; joined for {{convert|58|mi|km}} until Big Timber

: {{jct|country=USA|US|89}} in Livingston; joined for {{convert|7|mi|km}}

: {{jct|country=USA|US|212}} in Laurel; joined for {{convert|77|mi|km}} until Crow Agency

: {{jct|country=USA|US|87}} in Billings; joined for {{convert|128|mi|km}} until Sheridan, Wyoming

: {{jct|country=USA|I|94}} near Billings

;Wyoming

: {{jct|country=USA|US|14}} in Ranchester; joined for {{convert|16|mi|km}} until Sheridan

: {{jct|country=USA|US|87}} near Buffalo; joined for {{convert|12|mi|km}}

: {{jct|country=USA|I|25}} in Buffalo

: {{jct|country=USA|US|14|US|16}} in Gillette; joined for {{convert|25|mi|km}} until Moorcroft

: {{jct|country=USA|US|14}} in Sundance; joined for {{convert|132|mi|km}} until Wall, South Dakota

;South Dakota

: {{jct|country=USA|US|85}} in Spearfish; joined for {{convert|8|mi|km}}

: {{jct|country=USA|I|190|dab1=South Dakota|US|16}} in Rapid City

: {{jct|country=USA|US|83}} in Murdo; joined for {{convert|22|mi|km}} until Vivian

: {{jct|country=USA|US|183}} in Presho

: {{jct|country=USA|US|281}} near Plankinton

: {{jct|country=USA|I|29}} in Sioux Falls

: {{jct|country=USA|I|229|dab1=South Dakota}} in Sioux Falls

;Minnesota

: {{jct|country=USA|US|75}} in Luverne

: {{jct|country=USA|US|59}} in Worthington

: {{jct|country=USA|US|71}} in Jackson

: {{jct|country=USA|US|169}} in Blue Earth

: {{jct|country=USA|I|35}} in Albert Lea

: {{jct|country=USA|US|218}} in Austin; joined for {{convert|3|mi|km}}

: {{jct|country=USA|US|63}} in Stewartville

: {{jct|country=USA|US|52}} in Rochester

: {{jct|country=USA|US|14|US|61}} in Dakota; joined for {{convert|5|mi|km}} until La Crescent

;Wisconsin

: {{jct|country=USA|US|53}} in La Crosse; joined for {{convert|2|mi|km}} until Onalaska

: {{jct|country=USA|US|12}} in Tomah, Lyndon, and Delton

: {{jct|country=USA|I|94}} in Tomah; joined for {{convert|92|mi|km}} until Madison

: {{jct|country=USA|I|39}} in Portage; joined for {{convert|95|mi|km}} until Cherry Valley, Illinois

: {{jct|country=USA|US|51}} in Burke

: {{jct|country=USA|US|151}} in Madison

: {{jct|country=USA|US|12|US|18}} in Madison

: {{jct|country=USA|US|51}} in Christiana; joined for {{convert|4|mi|km}} until Albion

: {{jct|country=USA|I|43}} in Beloit

;Illinois

: {{jct|country=USA|US|51}} in South Beloit; joined for {{convert|17|mi|km}} until Rockford

: {{jct|country=USA|US|20}} in Hampshire

: {{jct|country=USA|I|290|dab1=Illinois}} in Schaumburg

: {{jct|country=USA|I|294|dab1=Illinois}} in Rosemont near Chicago

: {{jct|country=USA|I|190|dab1=Illinois}} to O'Hare International Airport near Chicago

: {{jct|country=USA|I|94}} in Chicago; joined for {{convert|17|mi|km}}

: {{jct|country=USA|I|290|dab1=Illinois}} in downtown Chicago

: {{jct|country=USA|I|55}} in downtown Chicago

: {{jct|country=USA|US|12|US|20|US|41}} near Chicago

;Indiana

: {{jct|country=USA|US|41}} in Hammond

: {{jct|country=USA|US|12}} in Gary

: {{jct|country=USA|I|65|US|12|US|20}} in Gary

: {{jct|country=USA|I|94|US|6}} in Lake Station

: {{jct|country=USA|I|80}} in Lake Station; joined for {{convert|278|mi|km}} until Elyria, Ohio

: {{jct|country=USA|US|421}} in New Durham Township

: {{jct|country=USA|US|31}} in South Bend

: {{jct|country=USA|US|131}} in York Township

: {{jct|country=USA|I|69}} in Fremont

;Ohio

: {{jct|country=USA|US|20}} in Maumee

: {{jct|country=USA|I|75}} in Rossford near Toledo

: {{jct|country=USA|I|280|dab1=Ohio}} in Lake Township

: {{jct|country=USA|US|250}} near Milan

: {{jct|country=USA|US|42}} in Cleveland

: {{jct|country=USA|I|71}} in Cleveland

: {{jct|country=USA|I|490|dab1=Ohio}} in Cleveland

: {{jct|country=USA|US|422}} in downtown Cleveland

: {{jct|country=USA|I|77}} in downtown Cleveland

: {{jct|country=USA|US|322}} in downtown Cleveland

: {{jct|country=USA|US|6}} in downtown Cleveland

: {{jct|country=USA|US|20}} in Euclid

: {{jct|country=USA|I|271}} in Willoughby Hills near Cleveland

;Pennsylvania

: {{jct|country=USA|US|6N}} in Springfield Township

: {{jct|country=USA|I|79}} near Erie

: {{jct|country=USA|US|19}} near Erie

: {{jct|country=USA|I|86|dab1=east}} near Erie

: {{jct|country=USA|US|20}} near North East

;New York

: {{jct|country=USA|US|20}} in Hanover

: {{jct|country=USA|US|219}} in West Seneca

: {{jct|country=USA|I|190|dab1=New York}} in Buffalo

: {{jct|country=USA|I|290|dab1=New York}} in Williamsville near Buffalo

: {{jct|country=USA|I|490|dab1=New York}} near Bergen

: {{jct|country=USA|I|390|dab1=New York}} near Rochester

: {{jct|country=USA|I|490|dab1=New York}} near Victor

: {{jct|country=USA|I|690|dab1=New York}} near Syracuse

: {{jct|country=USA|I|81}} in Syracuse

: {{jct|country=USA|I|481|dab1=New York}} near Syracuse

: {{jct|country=USA|I|790|dab1=New York}} in Utica

: {{jct|country=USA|I|890|dab1=New York}} near Schenectady

: {{jct|country=USA|I|88|dab1=east}} in Rotterdam

: {{jct|country=USA|I|890|dab1=New York}} near Schenectady

: {{jct|state=NY|I|87}} in Albany

: {{jct|country=USA|US|9}} in downtown Albany

: {{jct|country=USA|I|787|dab1=New York}} in downtown Albany

: {{jct|country=USA|US|4}} in East Greenbush

: {{jct|country=USA|US|9|US|20}} in Schodack

;Massachusetts

: {{jct|country=USA|US|20}} in Lee

: {{jct|country=USA|US|202}} in Westfield

: {{jct|country=USA|I|91|US|5}} in West Springfield

: {{jct|country=USA|I|291|dab1=Massachusetts}} in Chicopee near Springfield

: {{jct|country=USA|I|84|dab1=east}} in Sturbridge

: {{jct|country=USA|I|395|dab1=Connecticut|I|290|dab2=Massachusetts}} in Auburn

: {{jct|state=MA|SR|146}} in Millbury

: {{jct|country=USA|I|495|dab1=Massachusetts}} in Hopkinton

: {{jct|country=USA|I|95}} in Weston

: {{jct|country=USA|I|93}} in Boston

: {{jct|state=MA|SR|1A|extra=Airport}}/Logan International Airport in Boston

Auxiliary routes

:Source: FHWA{{cite web |date=January 26, 2022 |title=Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2021 |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |work=Route Log and Finder List |publisher=Federal Highway Administration |accessdate=February 10, 2022 |archive-date=July 3, 2017 |archive-url=https://web.archive.org/web/20170703182115/https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |url-status=live }}

Rapid City, South Dakota: I-190
Chicago, Illinois: I-190, I-290
Cleveland, Ohio: I-490
Buffalo, New York: I-190, I-290, I-990 (not directly connected)
Rochester, New York: I-390, I-490, I-590 (not directly connected)
Syracuse, New York: I-690
Utica, New York: I-790
Schenectady, New York: I-890
Worcester, Massachusetts: I-190 (not directly connected), I-290

I-90 in New York is the only Interstate Highway to have a complete set of auxiliary routes, all nine possible three-digit route numbers, within a single state. Eight of the thirteen states that the highway passes through do not have auxiliary routes of I-90.

References

External links

{{osmrelation-inline|303058}}
[https://www.aaroads.com/interstate-guide/i-090/ I-90 at Interstate-Guide.com]