Crews continue to monitor the highway as well as Pacific Coast Highway for potential impacts
LOS ANGELES – Caltrans crews are keeping the 3.6-mile stretch of Topanga Canyon Boulevard/State Route 27 (SR-27) between Pacific Coast Highway and Grand View Drive closed until further notice due to moderate rainfall in the canyon that could result in mud and debris flows.
The highway closed two hours early at 10 p.m. Thursday in advance of predicted rainstorms. It will reopen after the storms pass and crews have assessed potential impacts.
The National Weather Service is predicting the heaviest impacts to be between 3 a.m. and 6 p.m. Saturday, with a moderate risk for damaging flooding and debris flow. The storm is expected to last through Sunday. A flood watch is in effect from 1 a.m. to 10 p.m. Saturday.
NWS expects 2-3 inches of rain total, though that could be even higher in the Palisades Fire burn scar area. Peak rates remain around 0.25-0.50 inches/hour with isolated areas of 0.5-1.0 inches/hour, above the debris-flow threshold for the burn scar area.
Workers continue to evaluate and will assess the highway before reopening. They are also monitoring the recovery work zone on State Route 1/Pacific Coast Highway, but there are no impacts at this time.
Because conditions may change quickly, Caltrans District 7 will continue to share daily updates through the weekend via news release and on its social media pages, including Instagram, X and Facebook.
Motorists can check current traffic conditions on the Caltrans Quickmap.
This stretch of highway is an active work zone for ongoing recovery efforts from the Palisades Fire and winter storms. It is typically closed to the public from midnight to 5 a.m. daily.