Clarkson Construction is part of the Improve 70 Alliance, the Design-Build team delivering the Missouri Department of Transportation's $600 million Improve I-70: Warrenton to Wentzville project. One of the largest transportation investments in Missouri history, the project is modernizing approximately 20 miles of the I-70 corridor through Warren and St. Charles counties.
With construction occurring along an active interstate corridor, the Improve 70 Alliance is using strategic construction stating to maintain mobility while completing extensive paving, bridge, interchange, and roadway improvements.
Project Improvements
- Add a third lane in each direction on I-70 between Warrenton and I-64 in Wentzville
- Replace the existing I-70 pavement with new full-depth concrete pavement
- Reconstruct the I-70/I-64/U.S. 61 interchange in Wentzville
- Add a third lane in each direction on I-64 between I-70 and Route K
- Improve the Route 47 interchange in Warrenton
- Complete interchange and outer road improvements in Foristell and Wright City
- Improve the Route Z interchange and surrounding roadway connections
- Replace and improve bridges throughout the corridor
- Maintain two lanes of I-70 in each direction during peak travel periods throughout construction
Construction began in 2025 and is scheduled for completion in late 2028. The project is a major component of Missouri's statewide Improve I-70 Program and will enhance safety, capacity, and mobility for motorists and freight traveling between the Kansas City and St. Louis metropolitan areas.
