Semi crash blocks lanes on I-41/U.S. 45 at Mayfair Road in Wauwatosa

Southbound lanes have reopened on I-41/U.S. 45 near Mayfair Road after a semitrailer truck overturned on the freeway in the northbound lanes.

Northbound lanes remain closed from the Zoo Interchange, according to the Milwaukee County Sheriff's Office.

The northbound lanes are expected to be blocked until about 7:30 p.m., the state Department of Transportation said.