Interstate 170

Interstate 170 marker
Interstate 170
Inner Belt Expressway
Map
I-170 highlighted in red
Route information
Auxiliary route of I-70
Maintained by MoDOT
Length11.17 mi[1] (17.98 km)
Existed1956[citation needed]–present
NHSEntire route
Major junctions
South end I-64 / US 40 in Richmond Heights
Major intersections I-70 in Berkeley
North end I-270 in Hazelwood
Location
CountryUnited States
StateMissouri
CountiesSt. Louis
Highway system
US 169 Route 171

Interstate 170 (I-170), also known as the Inner Belt Expressway, is an 11.17-mile (17.98 km) 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.

  1. ^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved February 22, 2023.