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Missouri Route 370

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Missouri Route 370
StateMissouri
Route370
TypeMO
Length mi12.04
Established1993
MaintMOB
Direction aWest
Terminus aSt. Charles
Direction bEast
Terminus bBridgeton

Missouri Route 370 is a state highway in the United States serving the St. Louis metropolitan area with connections between St. Charles County and St. Louis County. The route provides a limited-access corridor linking suburban communities and facilitating freight and commuter movement across the Mississippi River corridor near major regional facilities such as Lambert–St. Louis International Airport and the Gateway Arch National Park area. Built to modern standards, the highway interfaces with federal and state routes, intermodal nodes, and regional planning initiatives.

Route description

Route 370 begins at an interchange with Interstate 70 near St. Charles and proceeds eastward as a divided freeway, crossing suburban and industrial zones adjacent to Missouri River floodplain areas and the Cuivre River State Park vicinity. The highway intersects U.S. Route 67 and connects with Missouri Route 94 before crossing the Missouri River via the newly constructed bridge over the Dardenne Creek corridor near shopping centers and logistics hubs that serve Boeing suppliers and Express Scripts. As it approaches Bridgeton and Maryland Heights, Route 370 links with Interstate 270 and provides access to Lambert–St. Louis International Airport surface routes, servicing passengers bound for Union Station and the Gateway Arch National Park tourist district. The alignment traverses wetlands, industrial parks, and residential areas near Creve Coeur Lake Memorial Park and terminates near I-270 while interfacing with local arterial systems feeding Chesterfield and Florissant.

History

Plans for the corridor emerged amid postwar suburban growth in the St. Louis metropolitan area as federal and state planners studied relief routes to complement Interstate Highway System spurs like I-70 and I-270. Early proposals referenced regional studies by the Metropolitan St. Louis Sewer District and transportation assessments involving the Missouri Department of Transportation and the Federal Highway Administration. The corridor’s development paralleled infrastructure projects such as the New Madrid Seismic Zone hazard assessments and environmental reviews influenced by the National Environmental Policy Act. Litigation and negotiations involved stakeholders including Citizens for Modern Transit, Sierra Club, local municipalities like St. Charles and Bridgeton, and institutions such as Washington University in St. Louis. Funding combined state bonds, federal grants under programs overseen by the United States Department of Transportation and allocations influenced by representatives like Claire McCaskill in later appropriations debates. The route was formally designated in the early 1990s as part of regional congestion mitigation and economic development initiatives tied to Lambert–St. Louis International Airport modernization.

Construction and design

Construction utilized contemporary engineering standards informed by projects like the New Mississippi River Bridge (later Stan Musial Veterans Memorial Bridge) and lessons from interstate expansions such as I-64 in St. Louis County. Designers coordinated with environmental agencies including the Environmental Protection Agency and the Missouri Department of Conservation to mitigate impacts on floodplains and wetlands adjacent to the Missouri River and Cuivre River State Park. Bridges and interchanges were engineered for freight loads servicing companies such as Anheuser-Busch distribution centers and logistics providers like FedEx and UPS. Materials sourcing involved regional contractors and suppliers tied to the Missouri Department of Transportation procurement framework and construction unions represented by groups affiliated with the United Brotherhood of Carpenters and Joiners of America. Design incorporated safety measures consistent with standards promoted by the American Association of State Highway and Transportation Officials and included intelligent transportation system elements similar to deployments on I-70 and I-270 corridors.

Major intersections

Major interchanges include the western terminus at I-70 near St. Charles, connections to Missouri Route 94 near Weldon Spring, an interchange with U.S. 67 serving St. Peters, and the eastern junction with I-270 near Bridgeton and Maryland Heights. Additional ramps provide access to local arterials serving industrial zones adjacent to Creve Coeur Airport and retail centers anchored by chains like Target Corporation and Walmart. The corridor’s junctions were modeled after successful interchange types used on I-64 and I-55 in the region.

Traffic and usage

Traffic volumes on the highway reflect commuter flows between bedroom communities such as Chesterfield and employment centers in Downtown St. Louis and Clayton, with significant truck traffic serving distribution centers for companies including Boeing, Anheuser-Busch, and regional warehouses operated by Amazon. Peak-hour congestion patterns mirror those observed on parallel routes like U.S. 67 and I-70, prompting multimodal planning involving agencies such as Metro Transit and the East–West Gateway Council of Governments. Crash and safety statistics are monitored by the Missouri State Highway Patrol and inspired targeted improvements paralleling efforts on I-270 and other metropolitan freeways.

Future plans and proposals

Regional plans considered by entities including the Missouri Department of Transportation, East–West Gateway Council of Governments, and municipal governments of St. Charles and Bridgeton contemplate capacity enhancements, interchange reconfigurations, and multimodal connections linked to Lambert–St. Louis International Airport expansion scenarios evaluated by the Federal Aviation Administration. Proposals also reference flood resilience strategies informed by studies of the Missouri River and climate assessments from institutions like University of Missouri System researchers. Coordination with freight initiatives championed by the United States Department of Transportation and funding mechanisms derived from congressional appropriations influenced by lawmakers such as Roy Blunt and Josh Hawley could enable phased improvements. Community groups including Sierra Club and local chambers of commerce remain active participants in planning discussions addressing noise, land use, and economic development around the corridor.

Category:State highways in Missouri