The southbound lanes of S. Walter Reed Drive are expected to remain closed throughout Wednesday’s evening rush hour as crews work to repair a large water main break.

The 16-inch water main burst this morning on Walter Reed Drive near Pollard Street, causing a messy and slippery commute for some drivers as the water runoff turned to ice. Crews thought they had isolated the leak around 11:00 a.m., but we’re told that the leak reopened this afternoon, meaning the repairs will take longer than first hoped.

Police are on scene helping to control traffic. A detour has been set up for those heading southbound on Walter Reed Drive between S. Glebe Road and Four Mile Run Drive. One northbound lane of Walter Reed Drive remains open.

“At this point, lane closures and detours are expected to stay through rush hour,” said Arlington Dept. of Environmental Services spokeswoman Robyn Mincher.