California State Route 84

File:La Honda.png.]]

File:Woodside California 2004.jpg at the intersection of Whisky Hill Road]]

The route begins at SR 1 on the Pacific coast near San Gregorio. It then heads northeast through San Mateo County, following San Gregorio Road and La Honda Road and crossing the Santa Cruz Mountains. As it enters Woodside, it intersects SR 35, also known as Skyline Boulevard. From the juncture of La Honda Road with Portola Road to US 101 it follows Woodside Road. It then passes through downtown Woodside. After intersecting I-280, it enters Redwood City, where it intersects SR 82, which carries El Camino Real through the South Bay. A few miles later, it interchanges with US 101, which it overlaps for a few miles.

Upon routing eastward, it enters the city of Menlo Park as an expressway, called the Bayfront Expressway, which features traffic signals at Menlo Park streets, at driveways serving Facebook headquarters, and at intersections with SR 114 and SR 109. The Marsh Road intersection, in 2013, was the site where a car struck cyclist Sam Felder , a Facebook employee, after he ran a red light. He died 3 months later.{{Cite web|url=https://www.almanacnews.com/news/2013/11/18/bicyclist-severely-injured-in-menlo-park-collision|title=Update: Bicyclist severely injured in Menlo Park accident|last=Brundage|first=Sandy|date=November 18, 2013|website=The Almanac}} The SR 114 (Willow Road) intersection was the site of a car crash in which author David Halberstam was killed on April 23, 2007.{{cite news|url=http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/04/23/BAGGPPE0TL3.DTL|title=Author David Halberstam killed in Menlo Park|work=San Francisco Chronicle|last=Coté|first=John |date=April 23, 2007 |access-date=23 April 2007}}

File:Dumbarton Bridge from Skeggs.png.]]

SR 84 then becomes a freeway at the south end of San Mateo County as it crosses as the Dumbarton Bridge over the San Francisco Bay. Midway over the bridge, it enters Alameda County. In Alameda County, it runs northward through the city of Newark, where it begins a concurrency southwards with I-880 for about one mile. Both interchanges with I-880 are partial cloverleaf interchanges. Upon separation, however, the route is not built to freeway standards as it enters the city of Fremont, following the streets of Thornton Avenue, Fremont Boulevard, Peralta Boulevard, and Mowry Avenue, which after, it has a short concurrency northwards with SR 238.

SR 84 then leaves Fremont through the historic Sunol Valley. Parts of the valley are extremely narrow and are referred to as Niles Canyon; this part of the route is officially a scenic route.{{Cite web|url=https://www.americanroadmagazine.com/forum/topic/791-california-state-route-84-newest-scenic-highway/|title=California State Route 84--newest Scenic Highway|website=AMERICAN ROAD® FORUM—the ultimate road trip planning community. Copyright AMERICAN ROAD, LLC 2006-2015|language=en-US|access-date=2017-12-06}} The section is known as Niles Canyon Road, and there are legends of a Niles Canyon ghost inhabiting the area.{{Cite news |last=Guerrero |first=Susana |date=4 March 2024 |title=The urban legend that won't die on this deadly Bay Area highway |url=https://www.sfgate.com/local/article/bay-area-niles-canyon-road-ghost-18684782.php}}

After exiting the valley, it begins an overlap with I-680. After separating, it runs through Vallecitos Valley. It then goes over grasslands until it reaches a pass, then enters the city of Livermore with Ruby Hill development on the left. SR 84 then runs along Isabel Avenue until it meets I-580, as the end of its southern section. SR 84 is unconstructed from I-580 to SR 12.

File:Ryer Island ferry.jpeg

The second section of SR 84 starts in Rio Vista at SR 12. It then follows the Ryer Island Ferry, which carries the route across the Cache Slough. When it leaves the ferry, it intersects SR 220. It continues northward and meets the end of state maintenance at the West Sacramento city limit, about six miles east of an intersection with CR E19. It then enters the city of West Sacramento in Yolo County. It then interchanges with I-80 Business, also signed as US 50. As it continues northward, it ends at I-80. From north of West Sacramento, SR 84 has been relinquished and was given to the city of West Sacramento in 2003.{{cite web|last1=Garcia|first1=Robert L.|title=Memorandum|url=http://www.dot.ca.gov/hq/transprog/ctcbooks/2003/0503/pdf/90(2.3c1).pdf|website=90(2.3c1).pdf|publisher=CalTrans|access-date=12 June 2016|pages=1–2|date=May 21, 2003}}

SR 84 is part of the California Freeway and Expressway System,{{CAFESystem}} and from I-280 to the eastern Fremont city limits and from the southern terminous of Isabel Avenue in Livermore to I-580 is part of the National Highway System,{{FHWA NHS map|region=californianorth|access-date=October 9, 2017}} a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.{{FHWA NHS}} SR 84 is eligible for the State Scenic Highway System,{{CA scenic}} and is designated as a scenic highway by the California Department of Transportation from SR 238 to I-680 in Alameda County,{{Caltrans scenic|access-date=October 9, 2017}} meaning that it is a substantial section of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community.{{Caltrans scenic info}}

File:CA-84 Woodside April 2023 002.jpg. ]]

Until recent years, all of CA-84 consisted of narrow, two-lane roads in California. This has remained almost unchanged except for urban areas and the CA-84 widening project in the Tri-Valley.

Route 84 is legally defined to continue from I-580 to SR 4 in Antioch, but there are currently no plans in place to bridge the gap at this time. A plan to build a $600 million toll road called the Mid-State Tollway along the proposed route was suspended in 2001 due to local opposition.{{cite web|title=Mid-State Tollway|url=https://web.archive.org/web/20190627205626/http://www.dot.ca.gov/hq/paffairs/about/toll/midstate.htm|publisher=CalTrans|access-date=15 April 2025}}

In the late 2000s and 2010s, a widening project began on Route 84 from I-680 near Sunol to I-580 in Livermore. This included a better connection between Stanley Boulevard and Isabel Avenue.{{Cite news|url=https://patch.com/california/livermore/isabel-avenue-state-route-84-widening-to-begin-monday|title=Isabel Avenue/State Route 84 Widening to Begin Monday|date=2012-06-15|work=Livermore, CA Patch|access-date=2017-12-06|language=en-US}} The project was to be done in five phases:

1. Isabel Avenue/I-580 interchange
2. Jack London Boulevard to Concannon Boulevard, including connections to Stanley Boulevard
3. Concannon Boulevard to Vallecitos Road intersection and southern Ruby Hill entrance
4. Northern side of pass
5. Southern side of pass to I-680

Costs were estimated to be between $400 and $500 million.{{Cite web|url=http://www.dot.ca.gov/d4/84isabelwidening/docs/sr84_public-information-meeting_5-26-2016.pdf|title=Isabel Widening Information}}

As of mid 2019, phases 1, 2, 3 and 4 are complete. This still leaves the southern section of CA 84 in its original condition.

Both the Ryer Island Ferry and the Howard Landing Ferry along Route 220 are the only state-run ferries, and there are no plans to replace them with bridges due to the low traffic numbers around Ryer Island.{{cite web | url=https://www.sfchronicle.com/travel/article/Last-public-car-ferries-still-ply-Sacramento-San-13266351.php | title=Last public car ferries still ply Sacramento-San Joaquin Delta | publisher=San Francisco Chronicle | date=October 3, 2018 |access-date=January 7, 2024}}{{cite web | url=https://www.abc10.com/article/entertainment/television/programs/backroads/delta-floating-highway-bartells-backroads/103-8ed833fb-6715-4a19-84d3-cafff1bbba2a | title=The Delta's floating highway | publisher=KXTV | date=February 10, 2023 |access-date=January 6, 2024}}{{cite web | url=https://www.cbsnews.com/sanfrancisco/news/california-delta-commuters-stymied-by-unreliable-ferry-service/ | title=California Delta commuters stymied by unreliable ferry service | publisher=KPIX | date=September 29, 2023 |access-date=January 7, 2024}} The only road bridge connecting Ryer Island is on its north side, which results in longer commutes for residents if one or both ferries shutdown.{{cite web | url=https://www.sfgate.com/bayarea/article/Tiny-delta-ferries-to-get-much-needed-repairs-3176900.php | title=Tiny delta ferries to get much-needed repairs | website=SFGate.com | date=October 3, 2018 |access-date=January 7, 2024}}

{{CAinttop|exit|post_ref=
{{Caltrans bridgelog|date=July 2007}}California Department of Transportation, [http://traffic-counts.dot.ca.gov/ All Traffic Volumes on CSHS], 2003, 2005, and 2006|exit_ref=
California Department of Transportation, California Numbered Exit Uniform System, [http://www.dot.ca.gov/trafficops/exit/docs/eightyfournorth.pdf SR-84 Northbound] and [http://www.dot.ca.gov/trafficops/exit/docs/eightyfoursouth.pdf SR-84 Southbound], accessed February 2008

}}

{{CAint|exit

|county=San Mateo

|cspan=12

|county_note=SM 0.00-R30.15

|location=San Gregorio

|postmile=0.00

|exit=

|road={{Jct|state=CA|SR|1|city1=Half Moon Bay|city2=Santa Cruz}}

|notes=Southwest end of SR 84

}}

{{CAint|exit

|location=Woodside

|lspan=2

|postmile=14.95

|exit=

|road={{Jct|state=CA|SR|35|name1=Skyline Boulevard|city1=San Francisco|city2=Santa Cruz}}

|notes=

}}

{{CAint|exit

|postmile=21.54

|exit=

|road={{Jct|state=CA|I|280|name1=Junipero Serra Freeway|city1=San Francisco|city2=San Jose}}

|notes=Interchange; I-280 exit 25

}}

{{CAint|exit

|location=Redwood City

|lspan=3

|postmile=24.70

|exit=

|road={{Jct|state=CA|SR|82|name1=El Camino Real}}

|notes=Interchange

}}

{{CAint|exit

|type=concur

|postmile=5.72

|line=yes

|postmile2=5.39Indicates that the postmile represents the distance along US 101 rather than SR 84.

|pmspan=2

|exit=

|road={{Jct|state=CA|US|101|dir1=north|name1=Bayshore Freeway|city1=San Francisco|road|Seaport Boulevard}}

|notes=Interchange; west end of US 101 overlap; US 101 exit 408

}}

{{CAint|exit

|mile=none

|place=Western end of freeway on US 101

}}

{{CAint|exit

|location=Menlo Park

|lspan=6

|postmile=3.59

|line=yes

|postmile2=R25.81

|pmspan=2

|place=Eastern end of freeway on US 101

}}

{{CAint|exit

|type=concur

|mile=none

|exit=

|road={{Jct|state=CA|US|101|dir1=south|name1=Bayshore Freeway|city1=San Jose|road|Marsh Road|city2=Atherton}}

|notes=Interchange; east end of US 101 overlap; US 101 exit 406

}}

{{CAint|exit

|postmile=R27.66

|exit=

|road=Willow Road (SR 114)

|notes=

}}

{{CAint|exit

|postmile=R28.19

|exit=

|road=University Avenue (SR 109)

|notes=

}}

{{CAint|exit

|postmile=none

|place=Western end of freeway

}}

{{CAint|exit

|postmile=none

|exit=—

|road=Ravenswood, S.F. Bay National Wildlife Refuge

|notes=

}}

{{Jctbridge|exit

|state=CA

|type=etc

|river=San Francisco Bay

|postmile=R29.25

|postmile2=R0.00

|bridge=Dumbarton Bridge (westbound toll only)

}}

{{CAint|exit

|county=Alameda

|cspan=15

|county_note=ALA R0.00-R28.63

|location=Newark

|lspan=3

|postmile=R3.75

|exit=36

|road=Thornton Avenue, Paseo Padre Parkway

|notes=

}}

{{CAint|exit

|postmile=R4.88

|exit=37

|road=Newark Boulevard, Ardenwood Boulevard

|notes=

}}

{{CAint|exit

|type=concur

|postmile=R6.01

|line=yes

|postmile2=10.30Indicates that the postmile represents the distance along I-880 rather than SR 84.

|exit=38

|road={{Jct|state=CA|I|880|dir1=north|name1=Nimitz Freeway|city1=Oakland|road|Decoto Road}}

|notes=Interchange; west end of I-880 overlap; I-880 exit 21; former SR 17 north

}}

{{CAint|exit

|location=Fremont

|lspan=4

|postmile=8.84

|line=yes

|postmile2=6.92

|pmspan=2

|place=Eastern end of freeway on I-880

}}

{{CAint|exit

|type=concur

|mile=none

|exit=

|road={{Jct|state=CA|I|880|dir1=south|name1=Nimitz Freeway|city1=San Jose|road|Thornton Avenue}}

|notes=Interchange; east end of I-880 overlap; I-880 exit 19; former SR 17 south

}}

{{CAint|exit

|type=concur

|postmile=10.82

|line=yes

|postmile2=3.31Indicates that the postmile represents the distance along SR 238 rather than SR 84.

|exit=

|road={{Jct|state=CA|SR|238|dir1=south|name1=Mission Boulevard|city1=San Jose}}

|notes=West end of SR 238 overlap

}}

{{CAint|exit

|type=concur

|postmile=3.64

|line=yes

|postmile2=10.83

|exit=

|road={{Jct|state=CA|SR|238|dir1=north|name1=Mission Boulevard|city1=Hayward|city2=Union City|road|Niles Boulevard}}

|notes=East end of SR 238 overlap

}}

{{CAint|exit

|location=Sunol

|type=incomplete

|postmile=16.93

|exit=

|road=Sunol (Main Street)

|notes=Interchange; eastbound exit and westbound entrance

}}

{{CAint|exit

|location=none

|lspan=2

|type=concur

|postmile=17.99

|line=yes

|postmile2=R11.04Indicates that the postmile represents the distance along I-680 rather than SR 84.

|pmspan=2

|exit=

|road={{Jct|state=CA|I|680|dir1=south|city1=Fremont|city2=San Jose|road|Calaveras Road}}

|notes=Interchange; west end of I-680 overlap; I-680 north exit 21A, south exit 21

}}

{{CAint|exit

|mile=none

|place=Western end of freeway on I-680

}}

{{CAint|exit

|location=none

|type=concur

|postmile=R11.85

|line=yes

|postmile2=17.99

|exit=—

|road={{Jct|state=CA|I|680|dir1=north|city1=Walnut Creek|city2=Sacramento}}

|notes=East end of I-680 overlap; I-680 north exit 21B, south via a U-turn at exit 21

}}

{{CAint|exit

|location=none

|postmile=none

|place=Eastern end of freeway

}}

{{CAint|exit

|location=Pleasanton

|postmile=23.56

|exit=

|road=Vallecitos Road – Downtown Livermore

|notes=Former SR 84 east

}}

{{CAint|exit

|location=Livermore

|lspan=2

|postmile=R26.22

|exit=

|road=Stanley Boulevard

|notes=Interchange

}}

{{CAint|exit

|postmile=none

|exit=

|road={{Jct|state=CA|I|580|city1=Oakland|city2=Stockton|road|Isabel Avenue to Portola Avenue}}

|notes=Interchange; northeast end of southwestern segment of SR 84; I-580 exit 51

}}

{{Jctgap}}

{{CAint|exit

|county=Solano

|cspan=3

|county_note=SOL 0.13-13.67

|location=Rio Vista

|postmile=0.13

|exit=

|road={{Jct|state=CA|SR|12|city1=Lodi|city2=Fairfield|city3=Rio Vista|road|Front Street}}

|notes=Interchange; south end of northern segment of SR 84

}}

{{CAint|exit

|location=none

|postmile=2.49

|place={{jct|extra=ferry}} Ryer Island Ferry across Cache Slough

}}

{{CAint|exit

|location=none

|postmile=7.25

|exit=

|road={{Jct|state=CA|SR|220|dir1=east|city1=Ryde}}

|notes=Western terminus of SR 220

}}

{{CAint|exit

|county=Yolo

|cspan=9

|county_note=YOL 0.00-24.05

|location=none

|postmile=9.53

|exit=

|road={{Jct|state=CA|CR|E19|county1=Yolo|dir1=east|name1=Clarksburg Road|city1=Clarksburg}}

|notes=Western terminus of CR E19

}}

{{CAint|exit

|location=West Sacramento

|lspan=8

|postmile=15.69

|place=North end of state maintenance at West Sacramento city limit

}}

{{CAint|exit

|postmile=R21.78

|exit=

|road={{Jct|state=CA|US|50|name1=I-80 BL, I-305|city1=San Francisco|city2=Sacramento}}

|notes=Interchange; former I-80; US 50 / I-80 BL exit 3

}}

{{CAint|exit

|postmile=21.84

|exit=

|road=To Capitol Mall (SR 275, Cabaldon Parkway)

|notes=Interchange; former US 40 / US 99W (1955–1964); formerly Tower Bridge Gateway

}}

{{CAint|exit

|postmile=22.06

|exit=

|road=West Capitol Avenue

|notes=Former US 40 / US 99W (1926–1955)

}}

{{CAint|exit

|postmile=22.68

|exit=

|road=Sacramento Avenue, Kegle Drive

|notes=Sacramento Avenue is former SR 16 east

}}

{{CAint|exit

|postmile=23.47

|exit=

|road=Sunset Avenue – Woodland

|notes=Former SR 16 west

}}

{{CAint|exit

|postmile=24.05

|exit=

|road={{Jct|state=CA|I|80|I|5|to2=1|location1=Reno|city2=San Francisco}}

|notes=Interchange; north end of SR 84; former I-880; I-80 exit 83; access to I-5 via I-80 east

}}

{{CAint|exit

|postmile=24.05

|exit=

|road=Reed Avenue

|notes=Continuation beyond I-80

}}

{{Jctbtm|col=6|keys=concur,etc,incomplete}}

{{reflist|group="N"}}

• {{portal-inline|California Roads}}

{{reflist|30em}}

{{commons category|California State Route 84}}

{{Attached KML|display=inline,title}}

{{CASR external links|SR|84}}

• [http://www.bayareafastrak.org/ Bay Area FasTrak] – includes toll information on the Dumbarton Bridge and the other Bay Area toll facilities
• [https://dot.ca.gov/caltrans-near-me/district-4/d4-projects/d4-solano-delta-ferry Caltrans: Delta Ferries] – includes information on the Ryer Island Ferry
• [http://www.aaroads.com/california/ca-084.html California @ AARoads - State Route 84]
• [http://www.dot.ca.gov/hq/paffairs/about/toll/midstate.htm Caltrans: Mid-State Tollway]
• [http://www.cahighways.org/081-088.html#084 California Highways: SR 84]

084

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State Route 084

State Route 084

State Route 084

State Route 084