U.S. Geological Survey Landslide Hazards Program

Force in Play

As of May 2026: Providing post-fire debris flow hazard assessments and early warning support

A Christmas Day atmospheric river dumped up to 12 inches of rain on Southern California's mountains, triggering mudslides that buried roads in Wrightwood and forced helicopter rescues from rooftops. More than 120 emergency responders rescued residents trapped in vehicles and homes overnight Christmas Eve.

Updated May 16