ST. CHARLES COUNTY – The Missouri Department of Transportation will close Route Z under Interstate 70 in Wentzville as part of the Improve I-70 Warrenton to Wentzville Project overnight starting Mon., Jan. 5, 2026, through Fri., Jan. 9, 2026. All work is weather permitting.
Route Z will be closed nightly from 10 p.m. to 5 a.m. for drainage work on Route Z underneath I-70. All entrance and exit ramps at Route Z will remain open.
This work is part of the reconstruction of Interstate 70 with adding a third lane in each direction and the realignment of I-70 between Wentzville Parkway and Route Z.
The Improve I-70 Warrenton to Wentzville Project covering the eastern portion of I-70 was awarded in November 2024. Construction is tentatively set to take place 2025-2028.
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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