City of Malibu:
"Traffic Alert: Topanga Canyon Closed for Storm Safety
Caltrans will fully close Topanga Canyon Blvd between Pacific Coast Highway (PCH) and Grand View Dr starting 9PM Tues, 12/23, due to forecasted heavy rain and potential for mud and debris flows in the Palisades Fire recovery area. No exact ETA for reopening, but the closure is expected through at least Fri, 12/26 with conditions reassessed daily.
The National Weather Service is forecasting significant rainfall Tuesday night through Saturday, with the heaviest impacts expected late Tuesday into Wednesday and again on Thursday, Christmas Day. Mud and debris flows are possible.
Expect mud, rocks and water on all roads. Expect delays, and avoid travel if possible - especially around burn scars. Drive cautiously and use headlights in the rain, watch for workers and work vehicles. Come to a complete stop at any malfunctioning traffic signal under CA law."