SAN FRANCISCO—A major street in Glen Park remains closed for the second day as crews cleared out loose rocks from a cliff.

Recent rainfall caused several boulders to tumble onto O’Shaughessy Boulevard forcing the road to be closed. Crews began scaling large boulders off the cliff after geologist found several loose rocks.

“Loose rocks have been falling off this slope for years. The rain from January 10 knocked down some bigger pieces. We had to close the road at the time to clear the debris,” said Raymond Lui with the Department of Public Works to the SF Gate.

O’Shaughnessy Boulevard in the Diamond Heights neighborhood will remained closed from Del Vale Avenue to Malta Drive until Friday, January 20.

“The geologists told us if there was more rain, more rocks could come down,” said Rachel Gordon, spokeswoman for the Department of Public Works to the SF Gate.

Drivers are recommended to use should use Diamond Heights, Teresita or Monterey Boulevards as alternative routes. Muni bus line 44 will be re-routed through the Miraloma neighborhood, the SF Gate reported.

Clearing out the loose rocks can take up to four to six hours. Engineers and geologist worked through Thursday evening to evaluate the cliff for a permanent solution, which could included netting or rock anchors, Lui explained.