City of St. Louis Development Activity


Mississippi River Bridge
1 Mound St.
St. Louis, MO 63102
(Map this address with Yahoo! Maps)


A proposed new Mississippi River Bridge has been designed four lanes wide.

Plans include:

A new, 4-lane, I-70 Mississippi River Bridge with design accommodations for a companion bridge to be built in the future.

A partial interchange in Missouri with existing I-70 near Cass Avenue.

Improvements at the I-55/64/70 Tri-Level Interchange in East St. Louis to accommodate ramp connections to and from I-55/70.

A roadway connection between the existing I-55/64/70 Interchange and the new bridge along the I-64 Connector alignment.

Design firm Crawford, Murphy & Tilly, Inc., has been selected to design the interchange on the Missouri side of the new bridge.

Developer IDOT, MODOT
Architect HNTB Corporation
Project Cost   $ 640,000,000
Funding Source(s)
State and federal funds
Status In Planning

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Last Updated: 08/28/2008