St. Charles County, MO – Drivers traveling through the Wentzville area should prepare for overnight detours this week as Route Z closes beneath Interstate 70 for ongoing construction tied to the I-70 expansion project.
According to the Missouri Department of Transportation (MoDOT), Route Z under I-70 in Wentzville will be closed overnight beginning Monday, January 5, 2026, through Friday, January 9, 2026, weather permitting. The nightly closures will run from 10 p.m. to 5 a.m. to allow crews to complete drainage work beneath the interstate.
MoDOT officials say the closure affects only the section of Route Z passing under I-70. All entrance and exit ramps at Route Z will remain open, allowing continued access to and from Interstate 70 during construction hours.
The work is part of the broader Improve I-70 Warrenton to Wentzville Project, a major infrastructure effort aimed at reconstructing Interstate 70. The project includes adding a third lane in each direction and realigning portions of the highway between Wentzville Parkway and Route Z, a corridor heavily traveled by commuters and freight traffic in St. Charles County.
Motorists traveling overnight are encouraged to allow extra time, follow posted detour signs, and remain alert for construction crews and equipment in the area. MoDOT notes that schedules may change depending on weather conditions.
Drivers can find the latest updates and project details on MoDOT’s official website.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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