Interstate 170
{{short description|Auxiliary Interstate Highway in St. Louis County, Missouri, United States}}
{{For|the former route in Baltimore, Maryland|Interstate 170 (Maryland)}}
{{Use mdy dates|date=August 2021}}
{{Use American English|date=April 2022}}
{{Infobox road
| state = MO
| type = I
| route = 170
| map = {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=250|frame-lat=38.702|frame-long=-90.347|zoom=10|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Interstate 170}}}}
| map_custom = yes
| map_notes = I-170 highlighted in red
| alternate_name = Inner Belt Expressway
| length_mi = 11.17
| length_ref = {{cite web |last=Starks |first=Edward |date=January 27, 2022 |title=Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |access-date=February 22, 2023 |work=FHWA Route Log and Finder List |publisher=Federal Highway Administration}}
| established = 1956{{cn|date=June 2019}}
| spur_type = I
| spur_of = 70
| direction_a = South
| terminus_a = {{jct|state=MO|I|64|US|40}} in Richmond Heights
| junction = {{jct|state=MO|I|70}} in Berkeley
| direction_b = North
| terminus_b = {{jct|state=MO|I|270}} in Hazelwood
| counties = St. Louis
| previous_type = US
| previous_route = 169
| next_type = MO
| next_route = 171
}}
Interstate 170 (I-170), also known as the Inner Belt Expressway, is an {{convert|11.17|mi|km|adj=on}} north–south auxiliary Interstate Highway in Greater St. Louis, Missouri. I-170 connects to I-270 at its northern terminus and I-64 at its southern terminus. I-170 crosses its parent, I-70, near St. Louis Lambert International Airport.
Route description
{{section missing|date=April 2022}}
History
I-170 was originally intended to provide an inner beltway within I-270 through St. Louis County extending to I-55 in the southern part of the county, commonly called South County;{{cite news |title = Hundreds of Homes Face Razing for New Highway |last = Sutin |first = Phil |last2 = Hopgood |first2 = Mei-Ling |date = January 9, 1997 |work = St. Louis Post-Dispatch }} however, the portion of the route south of I-64/US Route 40 (US 40) was canceled due to local opposition. The portion of MetroLink's Cross County Extension south of I-64 runs roughly along the proposed alignment.{{cite news |title = Westfall Sours On Extension of Interstate 170 |last = Sutin |first = Phil |date = March 14, 1997 |work = St. Louis Post-Dispatch }}
The southern portion of I-170 was built using St. Louis County funds in the 1960s through a shallow valley. It was signed as Route 725.
=Recent construction=
The southern two interchanges on I-170 (at I-64/US 40 and Galleria Parkway) were reconstructed as part of the first phase of the New I-64 project. Most notably, the new interchange includes direct access to I-170 from eastbound I-64; however, access to Galleria Parkway from northbound I-170 was eliminated. Eager Road access to and from I-170 was also revised in the New I-64 project.{{cite web |url = http://www.thenewi64.org/ProjectOverview.do |title = Project Overview |access-date = May 28, 2007 |work = The New I-64 |publisher = Missouri Department of Transportation |archive-url = https://web.archive.org/web/20070504060100/http://www.thenewi64.org/ProjectOverview.do |archive-date = May 4, 2007 |url-status = dead }}
Southern extension
Proposals have been made to extend I-170 south beyond its termination at I-64/US 40, and so connect to I-55, I-270, and I-44, and to towns such as Richmond Heights, Brentwood, Maplewood, and Marlbourough. These towns currently lack direct access to the Interstates, St. Louis Lambert International Airport, South County, and to each other. Many commuters travel on slower surface streets, such as Hanley Road or River Des Peres Boulevard, raising traffic in Shrewsbury and other residential towns.{{Cite news |url = http://www.stltoday.com/news/local/metro/linking-south-county-clayton-studied/article_2bc4cfcb-f84d-5af0-ae05-c705a7a69832.html |title = Linking South County, Clayton studied |first = Ken |last = Leiser |work = St. Louis Post-Dispatch |access-date = January 19, 2018 |language = en |url-access = subscription }} These proposals had been postponed due to lack of funding.{{Cite news |url = http://fox2now.com/2013/05/14/south-county-connector-1st-phase-of-170-south-extension/ |title = South County Connector: 1st Phase of 170 South Extension? |date = May 14, 2013 |work = FOX2now.com |access-date = January 14, 2018 |language = en-US }}
Exit list
{{jcttop|exit|state=MO|county=St. Louis|length_ref={{MoDOT Flex |access-date=March 18, 2015}}}}
{{MOint|exit
|location=Richmond Heights
|lspan=2
|mile=0.00
|exit=1
|road={{jct|state=MO|I|64|US|40|LCT|city1=Wentzville|city2=St. Louis}}
|notes=Signed as exits 1A (east) and 1B (west)}}
{{MOint|exit
|mile=0.438
|exit=1C
|type=incomplete
|road=Brentwood Boulevard north / Eager Road
|notes=Southbound exit and northbound entrance}}
{{MOint|exit
|location=Clayton
|lspan=2
|mile=0.809
|exit=1D
|type=incomplete
|road=Brentwood Boulevard south
|notes=Southbound exit and northbound entrance (via Galleria Parkway)}}
{{MOint|exit
|mile=1.170
|exit=1E
|road=Forest Park Parkway east
|notes=Western terminus of the Forest Park Parkway}}
{{MOint|exit
|location=Ladue
|mile=1.611
|exit=1F
|road=Ladue Road
|notes=}}
{{MOint|exit
|location=University City
|mile=2.374
|exit=2
|road=Delmar Boulevard
|notes=}}
{{MOint|exit
|location=Olivette
|mile=3.336
|exit=3
|road={{jct|state=MO|MO|340|name1=Olive Boulevard}}
|notes=}}
{{MOint|exit
|location=Overland
|mile=4.325
|exit=4
|road={{jct|state=MO|Supp|D|name1=Page Avenue}}
|notes=}}
{{MOint|exit
|location=St. John
|mile=5.865
|exit=5
|road={{jct|state=MO|MO|180|name1=St. Charles Rock Road}}
|notes=}}
{{MOint|exit
|location=Bel-Ridge
|mile=7.027
|exit=6
|road={{jct|state=MO|MO|115|name1=Natural Bridge Road|location1=Cargo City}}
|notes=Access to the University of Missouri-St. Louis}}
{{MOint|exit
|location=Berkeley
|lspan=6
|mile=7.654
|exit=7
|road={{Jct|state=MO|I|70|city1=St. Louis|city2=Kansas City}}
|notes=Signed as exit 7A (east) and 7B (west); exit 235}}
{{MOint|exit
|type=incomplete
|mile=7.771
|exit=7C
|road={{jct|extra=airport}} Lambert–St. Louis International Airport
|notes=Southbound exit is via exit 7B
}}
{{MOint|exit
|mile=8.577
|exit=8
|type=incomplete
|road=Scudder Road / North Hanley Road
|notes=No northbound entrance}}
{{MOint|exit
|mile=9.167
|exit=9A
|road=Airport Road – Cargo City
|notes=}}
{{MOint|exit
|type=incomplete
|mile=9.236
|exit=9B
|road=Boeing
|notes=Northbound exit and southbound entrance}}
{{MOint|exit
|type=incomplete
|mile=9.780
|exit=9C
|road=North Hanley Road
|notes=Northbound exit and southbound entrance}}
{{MOint|exit
|location=Hazelwood
|mile=10.894
|mile2=11.255
|exit=10
|road={{jct|state=MO|I|270|city1=Kansas City|location2=Chicago}}
|notes=Signed as exits 10A (west) and 10B (east)}}
{{Jctbtm|exit|keys = incomplete}}
References
{{reflist}}
External links
{{commons category|Interstate 170 (Missouri)}}
{{AttachedKML|display=title,inline}}
- [http://www.kurumi.com/roads/3di/i170.html#170mo Kurumi.com: Interstate 170]
{{3di|70}}