Missouri Route 370

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Route 370

Route 370 highlighted in red
Route information
Maintained by MoDOT
Length12.957 mi[1] (20.852 km)
Major junctions
West end I-70 in St. Peters
Major intersections
East end I-270 in Bridgeton
CountryUnited States
CountiesSt. Charles, St. Louis
Highway system
Route 367 Route 371

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. The St. Charles County segment of the freeway is signed as the Patrick J. Bray Memorial Highway.

Route description

Route 370 begins in St. Peters at a Y-interchange at I-70 exit 224 east of Mid Rivers Mall Drive and proceeds northeast. It loops around Fountain Lakes Park and crosses Cole Creek before turning to a southeasterly direction. It then passes north of St. Charles and interchanges with Route 94 at exit 7 before crossing the Missouri River. It then forms a Parclo interchange as it interchanges with Route 141 at exit 9 north of Earth City as it continues east. The route ends in Bridgeton, forming another Y-interchange at exits 22A and 22B on I-270 west of Missouri Bottom Road.[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 I-270.

MoDOT applied for an interstate highway designation of Interstate 370, but AASHTO rejected this in favor of the designation of Interstate 870. MoDOT did not want this because I-870 was their intended designation for what is now 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 list

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
I-270 north – Chicago, IL
Eastbound exit and westbound entrance
12.59620.27112BMissouri Bottom RoadEastbound exit and westbound entrance
I-270 south – Memphis, TN
Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  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. ^ "They built it, and they came: Highway 370, Discovery Bridge have served many purposes". Suburban Journals of Greater St. Louis (MO). December 12, 2006.