All southbound lanes of the U.S. 101 Freeway in downtown Los Angeles were closed at Mission Road on Wednesday morning after a water main broke and flooded the highway, according to the California Highway Patrol.

Flooding across all lanes was reported about 1:30 a.m., according to the CHP dispatch logs. The southbound lanes were expected to remain closed until at least 7 a.m., but the northbound lanes were open, according to the logs.

An 8-inch cast iron water main at 401 S. Boyle Ave. broke just after 1 a.m., said Renee Vazquez, a spokesperson with the Los Angeles Department of Water and Power. The main has since been shut down but 47 customers remain temporarily without water, she said.

The southbound lanes were closed between North Mission Road and 4th Street. The southbound onramp at 3rd Street was open.

Crews were spending the morning sweeping out water and mud from the roadway.