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Missouri Route 370 (Route 370) is a freeway that connects St. Louis County with St. Charles County via the Discovery Bridge over the Missouri River.

Route 370 marker

Route 370
Route information
Length12.957 mi[1] (20.852 km)
Major junctions
West end I-70 in St. Peters
  Route 94 in St. Charles
Route 141 in Bridgeton
East end I-270 in Bridgeton
Highway system
Route 367Route 371

Route descriptionEdit

From west to east, Route 370 begins in St. Peters at Interstate 70 east of Mid Rivers Mall Drive and ends in Bridgeton at Interstate 270 west of Missouri Bottom Rd.[2]


Construction on Route 370 began in the early 1990s. It was built to replace the section of St. Charles Rock Road, then designated as Route 115, west of Interstate 270.

Route 370 was considered to be Interstate 370 but AASHTO would only allow it if it was renumbered Interstate 870. MODOT did not want this because the designation of Interstate 870 was for the new southern freeway which is now designated as Interstate 255.[3]

On December 16, 1992, the first section of the highway opened allowing direct access to St. Charles at Route 94 from I-270. It replaced the crumbling Old St. Charles Bridge that carried Route 115 traffic. On April 1, 1993, the road was designated as Route 370. In 1993, the Great Flood of 1993 surrounded much of the highway which is built on top of an embankment. As the flood waters surrounded the highway, many of the new exits had been shut down because the roads it connected to were underwater. Despite the flood, construction resumed on the highway until it was completed in 1996.

Exit listEdit

St. CharlesSt. Peters0.000–
1  I-70 – St. Louis, Kansas CityWestern terminus; signed as exits 1A (east) and 1B (west)
1CSalt River RoadWestbound exit and eastbound entrance
2.6874.3242Truman Boulevard / Lakeside Park Drive
St. Charles5.1108.2245Elm Street / New Town Boulevard
7.88212.6857   Route 94 / Lewis and Clark Trail (North 3rd Street)
Missouri River8.45413.605Discovery Bridge
St. LouisBridgeton9.36315.0689  Route 141 south (Earth City Expressway)Northern terminus of Route 141
11.63218.72011St. Louis Mills Boulevard
12.34319.86412A  I-270 north – Chicago, ILEastbound exit and westbound entrance
12.59620.27112BMissouri Bottom RoadEastbound exit and westbound entrance
12.95720.85212C  I-270 south – Memphis, TNEastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See alsoEdit


Route map:

KML is from Wikidata
  1. ^ a b Missouri Department of Transportation (December 26, 2013). MoDOT HPMAPS (Map). Missouri Department of Transportation. Retrieved December 26, 2013.
  2. ^ Google (December 22, 2012). "Missouri Route 370" (Map). Google Maps. Google. Retrieved December 22, 2012.
  3. ^ "Interstate-Guide: Interstate 370 Missouri". Retrieved 2017-01-30.