A SigAlert was issued after a mudslide near Malibu on a rainy Friday morning triggered the closure of Topanga Canyon Boulevard, authorities said.
All lanes of State Route 27 were shut down between PCH and Grand View Drive shortly before 10 a.m. because of a slide that left the roadway covered in mud and rocks, according to the California Highway Patrol's incident log.
The slide occurred on Topanga Canyon Boulevard, according to CHP Officer Elizabeth Kravig. She said the closure began on PCH but didn't impact the highway.
CHP's Moorpark office initially tweeted that all lanes of PCH were shut down before providing updated information on the social media platform.
Crews are working to clean up the muddy roadway, but it was not expected to reopen until at least 6 a.m. Saturday.
About two hours before the mudslide, the National Weather Service noted an increase in rainfall intensity in Malibu and the Santa Monica Mountains.
KTLA's Jennifer Thang contributed to this story.
Crews are working to clear State Route 27 (Topanga Canyon Boulevard) and make highway safe for driving. For now, SR-27 is closed from PCH to Grand View. Check https://t.co/xbyTKr1JsE for updates on travel conditions. #CAstorm #LArain pic.twitter.com/fA3azCm0kR
— Caltrans District 7 (@CaltransDist7) March 3, 2018
Update info: State Route 27 (Topanga Canyon Blvd) CLOSED between State Route 1 (Pacific Coast Highway) and the community of Topanga for a mud and rock slide blocking both lanes. Alternate Route=Las Virgenes Road / Malibu Canyon Road. @CHPsouthern @CHPWestValley pic.twitter.com/l6GLcoUm26
— CHP Moorpark (@CHPMoorpark) March 2, 2018
— NWS Los Angeles (@NWSLosAngeles) March 2, 2018