All ramps connecting Interstate 70 with Routes T and W in Foristell are scheduled to close overnight Wednesday, August 19, as crews prepare to introduce a new traffic pattern at the interchange.
According to the Missouri Department of Transportation, the closure is scheduled to begin at 11 p.m. Wednesday. The ramps are expected to reopen by 4 a.m. Thursday, August 20.
The closure will allow crews to convert the interchange to its new divergeabout configuration.
What drivers should expect
When the ramps reopen Thursday morning, motorists will encounter a substantially different traffic pattern:
- Northbound traffic will use the western bridge.
- Southbound traffic will use the eastern bridge.
- Drivers should follow the new pavement markings and posted signs.
- Traffic entering a roundabout must yield to vehicles already circulating.
- Motorists should use turn signals when leaving the roundabout.
Drivers familiar with the temporary construction pattern should not rely on habit when approaching the interchange. Allow additional time, reduce speed and watch carefully for signs directing traffic through the new configuration.
I-70 traffic
The announced closure applies to the interchange ramps between I-70 and Routes T and W. Drivers who need to enter or leave I-70 at Foristell during the overnight closure should use another interchange.
Construction schedules remain subject to weather and other conditions.
Part of the larger I-70 project
The interchange reconstruction is part of MoDOT’s Improve I-70: Warrenton to Wentzville project. The larger project will reconstruct the interstate, add a third lane in each direction and make interchange and outer-road improvements throughout the corridor.
The Warrenton-to-Wentzville project is expected to continue through 2028.
For official construction updates and possible schedule changes, visit the MoDOT Improve I-70 project page.
Explore Foristell is an independent community publication and is not affiliated with the City of Foristell or the Missouri Department of Transportation.