ST. CHARLES COUNTY – Crews with the Improve I-70 Warrenton to Wentzville Project will shift all eastbound Interstate 70 lanes to the left and reduce lane widths to 10-foot lanes at Route Z starting overnight from 9 p.m. Monday, September 14. This lane shift and width reduction will be in place by the morning commute Tuesday, September 15 and remain in place through spring 2027. All work is weather permitting.
In addition to the lane shifts and lane reductions, the eastbound I-70 exit ramp to Route Z (exit 209) will be closed for 30 days starting at 9 p.m. Wednesday, September 9. Crews will be working on connecting the new paving to the interstate and exit ramp.
Motorists are encouraged to pay attention in work zones, drive the posted work zone speed limit, and allow extra time for travel. All work is weather-dependent, and schedules are subject to change.
This work is part of the second project in MoDOT’s Statewide Improve I-70 Program. Improve I-70: Warrenton to Wentzville is a $600 million Design-Build project that will improve the 20-mile stretch of I-70 between Warrenton and Wentzville. The project was awarded to the Improve 70 Alliance team in November 2024. Construction is anticipated to be complete by the end of 2028.
Missouri’s FY2024 budget, approved through the state legislative process and signed into law by the governor, provides $2.8 billion in General Revenue to build a third lane of I-70 across the state. The program will plan, design, construct, reconstruct, rehabilitate, and add a third lane in each direction on nearly 200 miles of I-70, from Blue Springs to Wentzville.
For more information on the Improve I-70 Program and to sign up for program e-mails, visit http://www.modot.org/improvei70.
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