Interstate 170

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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.

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 }}

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 }}

{{jcttop|exit|state=MO|county=St. Louis|length_ref={{MoDOT Flex |access-date=March 18, 2015}}}}

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|notes=Signed as exits 1A (east) and 1B (west)}}

{{MOint|exit

|mile=0.438

|exit=1C

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|road=Brentwood Boulevard north / Eager Road

|notes=Southbound exit and northbound entrance}}

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{{MOint|exit

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|notes=Western terminus of the Forest Park Parkway}}

{{MOint|exit

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|notes=}}

{{MOint|exit

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|road=Delmar Boulevard

|notes=}}

{{MOint|exit

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|exit=3

|road={{jct|state=MO|MO|340|name1=Olive Boulevard}}

|notes=}}

{{MOint|exit

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|exit=4

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|notes=}}

{{MOint|exit

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|exit=5

|road={{jct|state=MO|MO|180|name1=St. Charles Rock Road}}

|notes=}}

{{MOint|exit

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|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

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|exit=7

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|notes=Signed as exit 7A (east) and 7B (west); exit 235}}

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{{MOint|exit

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|road=Airport Road – Cargo City

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|notes=Northbound exit and southbound entrance}}

{{MOint|exit

|location=Hazelwood

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|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}}

{{reflist}}

{{commons category|Interstate 170 (Missouri)}}

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• [http://www.kurumi.com/roads/3di/i170.html#170mo Kurumi.com: Interstate 170]

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Category:Transportation in St. Louis County, Missouri