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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
Counties: St. Louis
Highway system
US 169 Route 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 1
    • Recent construction 1.1
  • Exit list 2
  • References 3
  • External links 4


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.

Location mi[5] km Exit Destinations Notes
Richmond Heights 0.00 0.00 1 I-64 / US 40 / Lewis and Clark Trail – Wentzville, St. Louis Signed as exits 1A (east) and 1B (west)
0.438 0.705 1C Brentwood Boulevard north / Eager Road Southbound exit and northbound entrance
Clayton 0.809 1.302 1D Brentwood Boulevard south Southbound exit and northbound entrance (via Galleria Parkway)
1.170 1.883 1E Forest Park Parkway east Western terminus of the Forest Park Parkway
Ladue 1.611 2.593 1F Ladue Road
University City 2.374 3.821 2 Delmar Boulevard
Olivette 3.336 5.369 3 Route 340 (Olive Boulevard)
Overland 4.325 6.960 4 Route D (Page Avenue)
St. John 5.865 9.439 5 Route 180 (St. Charles Rock Road)
Bel-Ridge 7.027 11.309 6 Route 115 (Natural Bridge Road) – Cargo City
Berkeley 7.654 12.318 7 I-70 – St. Louis, Kansas City Signed as exit 7A (east) and 7B (west); exit 235
7.771 12.506 7C Lambert–St. Louis International Airport Southbound exit is via exit 7B
8.577 13.803 8 Scudder Road / North Hanley Road No northbound entrance
9.167 14.753 9A Airport Road – Cargo City
9.236 14.864 9B Boeing Northbound exit and southbound entrance
9.780 15.739 9C North Hanley Road Northbound exit and southbound entrance
Hazelwood 10.894–
10 I-270 – Kansas City, Chicago Signed as exits 10A (west) and 10B (east)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ "Route Log and Finder List - Interstate System - table 2".  
  2. ^ Sutin, Phil; Hopgood, Mei-Ling (1997-01-09). "Hundreds of Homes Face Razing for New Highway".  
  3. ^ Sutin, Phil (1997-03-14). "Westfall Sours On Extension of Interstate 170".  
  4. ^ "Project Overview". The New I-64.  
  5. ^  

External links

  • Interstate 170
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