SAN DIEGO - A water main break forced the closure of a North Park street on Tuesday and left several dozen residences without functional plumbing.

The ruptured 6-inch-diameter iron water main began undermining the 2400 block of Commonwealth Avenue and inundating traffic lanes about 10:30 a.m., according to the San Diego Water Department.

It took crews about an hour to halt the overflow, SDWD spokesman Arian Collins said. No structural flooding was reported, he said.

The mishap left about 30 residences without water service. Repair personnel expected to have the pipeline back in operation and the road reopened by early to mid-evening, according to Collins.