A water main break sent water and mud onto the busy Roosevelt Boulevard overnight.
The 12-inch main broke around 2:30 a.m. Saturday in the northbound outer lanes by Levick Street, said Philadelphia firefighters.
The break buckled the roadway and blocked all northbound lanes of Route 1 for about an hour. It continued to block the outer lanes after daybreak.
The Philadelphia Water Department shut off the main and began repairs. As of mid-afternoon, the outer lanes remained closed and crews expected to continue working for several hours.
No injuries were reported and no water appeared to get into nearby homes but it did impact a nearby Dunkin' Donuts.