SAN FRANCISCO (CBS SF) — Heavy overnight rainfall likely caused a 20-by-30-foot hole sinkhole still growing in the Bay Area Wednesday morning.
San Francisco Public Utilities Commission responded to a report of a sinkhole at Sixth Avenue and Lake Street at 9:17 a.m. Traffic was unable to pass between Fifth and Sixth streets.READ MORE: Cal Fire Units Respond to Wildland Fire Close to Santa Cruz County Prescribed Burn
SFPUC spokeswoman Jean Walsh said sand had eroded around a water main pipe at the intersection, leaving the pipe exposed. At some point Wednesday morning, the pipe collapsed, causing more sand and rocks to erode.
Later investigation reported rain had weakened the soil under a century-old water main that had survived the 1906 earthquake. It was built in 1905, but the storm overnight was finally too much for its brittle walls.
Walsh said residences located within two blocks of the area are without water as crews work to repair the water main, which could take several hours.READ MORE: AC Transit Bus Crashes Into West Oakland Home
Crews will work on the ruptured storm drain tonight and will likely work on road reconstruction on Thursday, Walsh said.
Earlier, cars traveling westbound on the Bay Bridge tried to avoid a 2-foot-wide pothole in a lane just before the Treasure Island tunnel. Caltrans previously closed two lanes to make the repairs.
UPDATE: Witness Claims Oakland Police Searching for Wrong Car in Road Rage Homicide
TM and © Copyright 2014 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2014 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Bay City News Service contributed to this report.