Jefferson County, MO – Drivers traveling southbound on Interstate 55 in Jefferson County should prepare for overnight closures this week as crews begin critical bridge construction work near Route M.
According to the Missouri Department of Transportation (MoDOT), all southbound lanes of I-55 will close nightly from Monday, December 15, through Saturday, December 20, between 11 p.m. and 5 a.m., weather permitting. The closures are needed to allow crews to set bridge girders for a new structure over the BNSF Railroad.
The affected stretch of interstate is located between Route M and Route Z, an area frequently used by commuters traveling between Jefferson County and the greater St. Louis metro area. Drivers traveling during overnight hours are encouraged to plan ahead and allow extra travel time.
During the closure, traffic will be redirected using a signed detour route. Southbound drivers will exit I-55 at Route M (Exit 185) and turn left. From there, motorists will continue north on U.S. Route 61/67, then follow the route until reaching Route Z, where they will turn right and use the on-ramp on the left side of Route Z to re-enter southbound I-55.
MoDOT advises motorists to remain alert for construction signage, slow-moving equipment, and changing traffic patterns throughout the week. While the work is scheduled overnight to minimize daytime disruption, drivers who typically travel late at night or early in the morning may experience delays.
Officials note that construction schedules may change depending on weather conditions. Drivers are encouraged to check MoDOT’s traveler information system before heading out.
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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