The Missouri Department of Transportation will close the northbound Hwy. 21 off-ramp to Hwy. 141 between Arnold and Fenton at 10 p.m. tonight, Aug. 30, for pavement repairs.
The off-ramp is scheduled to remain closed until 2 a.m. Thursday.
Drivers need to use alternate routes to get to Hwy. 141, MoDOT officials said.