Missouri DOT Awards 6th Contract for $2.8B Improve I-70 Program

The Missouri Department of Transportation continues to roll out work on its record-breaking Improve I-70 project with a new $583 million contract.

The Improve I-70: Kingdom City to Warrenton design-build contract went to the Millstone Weber Team — a venture consisting of Millstone Weber, designer Jacobs Inc. and key partner WSP — as the apparent best-value bidder.

The new contract, the sixth of eight planned for the project, will add a third lane in each direction along a 44-mile corridor of I-70 between Kingdom City and Warrenton. Millstone Weber Team will also replace three bridges, rehabilitate six others, add a fourth climbing lane along eastbound I-70 at Mineola Hill, and redesign the Norfolk Southern Railroad Crossing at High Hill.

Work on this contract is set to begin next spring or summer and estimated to wrap up in late 2030.

This leaves two contracts to add third lanes left to award for the Improve I-70 umbrella. Those will be for the 15.5-mile Odessa to Concordia contract and the 42-mile, $541-million Concordia to Boonville contract. Both are expected to be awarded by May.

The overarching Improve I-70 project, the most expensive roadbuilding project in Missouri’s history, will bring all 200 miles of I-70 in the state to three lanes in both directions to address traffic capacity and outdated interchange designs. Missouri’s FY2024 budget allocated $2.8 billion in general revenue for the project.

The second Improve I-70: Warrenton to Wentzville Project, awarded in 2026, was the largest single contract in the state’s history at $600 million.