Interstate 170

Interstate 170 marker

Interstate 170
Inner Belt Expressway
Route information
Maintained by MoDOT
Length: 11.17 mi[1] (17.98 km)
Existed: 1956 – present
Major junctions
South end: I-64 / US 40 in Richmond Heights
  I-70 in Berkeley
North end: I-270 in Hazelwood
Location
Counties: St. Louis
Highway system
← US 169Route 171 →

Interstate 170 (I-170) is the designation for an interstate route in the St. Louis, Missouri metropolitan area. I-170, also known as the Inner Belt Expressway, is an 11.17-mile (17.98 km) highway traveling north-south through the St. Louis suburbs.

I-170 connects to Interstate 270 at its northern terminus and Interstate 64 at its southern terminus; at exits 7A and 7B, I-170 crosses its parent, I-70. Interstate 170 also provides access to Lambert-St. Louis International Airport.

History

I-170 was originally intended to provide an inner beltway within I-270 through St. Louis County extending to I-55 in the South County area;[2] however, the portion of the route south of I-64/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.[3]

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.[4]

Exit list

The entire route is in St. Louis County.

Locationmi[5]kmExitDestinationsNotes
Richmond Heights0.000.001 I-64 / US 40 / Lewis and Clark Trail – Wentzville, St. LouisSigned as exits 1A (east) and 1B (west)
0.4380.7051CBrentwood Boulevard north / Eager RoadSouthbound exit and northbound entrance
Clayton0.8091.3021DBrentwood Boulevard southSouthbound exit and northbound entrance (via Galleria Parkway)
1.1701.8831EForest Park Parkway eastWestern terminus of the Forest Park Parkway
Ladue1.6112.5931FLadue Road
University City2.3743.8212Delmar Boulevard
Olivette3.3365.3693 Route 340 (Olive Boulevard)
Overland4.3256.9604 Route D (Page Avenue)
St. John5.8659.4395 Route 180 (St. Charles Rock Road)
Bel-Ridge7.02711.3096 Route 115 (Natural Bridge Road) – Cargo City
Berkeley7.65412.3187 I-70 – St. Louis, Kansas CitySigned as exit 7A (east) and 7B (west); exit 235
7.77112.5067C Lambert–St. Louis International AirportSouthbound exit is via exit 7B
8.57713.8038Scudder Road / North Hanley RoadNo northbound entrance
9.16714.7539AAirport Road – Cargo City
9.23614.8649BBoeingNorthbound exit and southbound entrance
9.78015.7399CNorth Hanley RoadNorthbound exit and southbound entrance
Hazelwood10.894–
11.255		17.532–
18.113		10 I-270 – Kansas City, ChicagoSigned as exits 10A (west) and 10B (east)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

  1. ↑ "Route Log and Finder List - Interstate System - table 2". Federal Highway Administration. 2002-10-31. Retrieved 2007-07-08.
  2. ↑ Sutin, Phil; Hopgood, Mei-Ling (1997-01-09). "Hundreds of Homes Face Razing for New Highway". St. Louis Post-Dispatch.
  3. ↑ Sutin, Phil (1997-03-14). "Westfall Sours On Extension of Interstate 170". St. Louis Post-Dispatch.
  4. ↑ "Project Overview". The New I-64. Missouri Department of Transportation. Archived from the original on 2007-05-04. Retrieved 2007-05-28.
  5. ↑ Missouri Department of Transportation (March 18, 2015). Flex Map Viewer (Map). Missouri Department of Transportation. Retrieved March 18, 2015.

Route map: Google

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