CHESTERFIELD, Mo. (KSDK) - An accident on westbound Interstate 64 on the Boone Bridge in Chesterfield has traffic backed up all the way to Boone's Crossing.
The Missouri Department of Transportation says a semi hit a guard rail on the bridge around 8 p.m.
Engineers say there's no structural damage.
Crews are working to remove the truck, and two lanes are closed.
KSDK