ST. LOUIS – With nearly 180 projects across four counties and the city of St. Louis, drivers may encounter some type of construction this year on many of the routes they use daily.
Most of those projects are taking care of the existing system, rehabilitating bridges, replacing signals and sidewalks, and resurfacing to ensure the roadways remain safe and operational for all users.
The work totals a nearly $1.7 billion investment in the region’s roads and bridges, as well as a $600 million investment by the state legislature in the region as part of the Improve I-70 Design-Build Project #2 between Warrenton and Wentzville.
Some of the work and impacts include:
- Interstate 55 bridge and pavement improvements – This project replaces or rehabilitates the driving surfaces on several bridges along I-55 between I-44 and River Des Peres. This year, crews will work between River Des Peres and Loughborough on both the northbound and southbound lanes. Drivers can expect closed and shifted traffic lanes between Weber and Loughborough as crews remove and replace the driving surface on several bridges. Crews will pave portions of the interstate and associated interchanges as bridge work is completed. The project continues through late 2025.
- Interstate 55 Corridor Upgrades in Jefferson County- This is a three-year design-build project which adds a third lane within the eight-mile section of I-55 just north of the Route Z interchange in Pevely (where the 3-lane section currently ends) to I-55/U.S. Route 67 in Festus. The project is underway. Intersection improvements will be made at I-55 and Route Z, McNutt, and the U.S. Route 67 interchanges. Minor work is also planned at the Route A Interchange.
- I-64 at the Missouri River – Rehabilitation of the westbound Boone Bridge over the Missouri River – One lane will be closed in each direction on the interstate, and two lanes of westbound traffic will be moved to the eastbound bridge. Begins this spring and should be complete early next year.
- I-64 Outer Road bridge replacement- Bridge replacement and roadway improvements at the I-64 Outer Road (Technology Drive) at Dardenne Creek. The outer road will be closed during this work with a detour between Route K and Winghaven. Begins summer 2025 and completed in 2026
- Interstate 70 in St. Charles County – The Improve I-70 Project #2 Design Build project Warrenton to Wentzville. Construction starts this year and includes widening I-70 from Route 47 in Warrenton to the I-70/I-64/US 40/US 61 interchange in St. Charles County. Also realigns the roadway from Wentzville Parkway to Route Z to reduce the curve and replace the railroad bridge. Updates the I-70/I-64/US 40/US 61 interchange and widens I-64 from I-70 to Route K. Constructs a divergeabout at I-70 and Route W to improve traffic flow for current and future growth.
- I-270 at Riverview – MoDOT is constructing a new diamond interchange at Route H (Riverview) and I-270, as part of improvements needed at the I-270 Chain of Rocks bridge across the Mississippi River, being completed by the Illinois Department of Transportation. Crews will soon begin tearing down the old I-270 bridge over Riverview. The project is expected to be complete in December 2026.
- Interstate 270 bridge replacement – This project continues work to replace the I-270 bridge over Conway just north of the I-64 interchange. The project also widens and replaces the driving surface on the I-270 bridge over Ladue Road. Work should be completed by late 2025.
- Route 61/67 (Lindbergh) roadway improvements – This project continues to update signals and sidewalks to meet Americans with Disabilities Act requirements and resurfaces the roadway between Swan Drive and Route D (Page Ave). The left turn lane from northbound Lindbergh to German is closed to allow utility crews to relocate two gas lines. The project also includes a complete roadway closure in summer 2025 to remove and replace the bridge over Deer Creek.
More information on all projects currently underway or planned for this year in the St. Louis area is available at Projects | Missouri Department of Transportation. Maps of all planned work by county are available at: St. Louis Construction by area | Missouri Department of Transportation.
