All southbound lanes are closed on I-41 at Waukesha County Highway Q in Menomonee Falls

All southbound lanes are closed on I-41 at Waukesha County Highway Q in Menomonee Falls because of an accident, the state Department of Transportation said.

Traffic is being diverted off I-41 to County Highway Q.

Lanes are expected to be reopened by 8:30 p.m.