UPDATE: Traffic reopened after crash blocks I-41 south near Menomonee Falls
Update: All lanes are now clear after an accident at I-41 south of Pilgrim Road near Monomonee Falls.
A crash has blocked all lanes of I-41 south at Pilgrim Road near Menomonee Falls. The back up is about three miles long.
Travelers are encouraged to use an alternate route.
CBS 58 has a crew at the scene who says it looks like the crash involves a motorcycle.
Stay with CBS 58 through this developing story.