Mudflow Triggers Pacific Coast Highway Closure in Malibu

written by a member of the WCB

Severe Weather Impacts Coastal Region

A series of back-to-back storm systems have caused significant disruption along the Pacific Coast Highway (PCH), with mudflows forcing a complete closure between Chautauqua Boulevard in Los Angeles and Carbon Beach Terrace in Malibu.

Mudflow Details

• Location: Just north of Big Rock Drive in Malibu

• Debris Removed: Approximately 10 truckloads of wet dirt and debris

• Caltrans Response: Immediate clearance and road closure

Monitoring and Safety Measures

Caltrans officials issued a critical warning: “Out of an abundance of caution, the highway must be closed due to soft soils on both the hill and ocean sides of the road. Mud and debris flows may occur and canyons may overtop, blocking the road or causing further damage.”

Access Restrictions

• Complete highway closure

• Only essential workers permitted

• Residents with passes can access Pacific Palisades via Chautauqua

Weather Context

The mudflow is part of a larger storm system affecting Southern California:

• Second in a pair of back-to-back storm systems

• Triggered minor mudslides in the Palisades Fire burn area

• Meteorologists warn of potential “wettest period” of the rain season

Potential Risks

• Rainfall rates: Up to 1 inch per hour

• Predicted precipitation:

• Coastal areas: 2-4 inches

• Mountains and foothills: 4-8 inches

Emergency Preparedness

Local authorities are on high alert, with public works crews:

• Installing concrete barriers

• Deploying compost filter socks

• Creating additional debris basin capacity

Residents are advised to prepare for potential worst-case scenarios and stay informed about changing weather conditions.