Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help planners anticipate future mudflows.

A wall of sandstone boulders, some the size of RVs, barreled through Montecito, followed by a growing tail of water, mud and debris. On its way to the ocean, the mudflow’s momentum shifted as it ...

A significant mudflow event has prompted the city of Glenwood Springs to close down access to Red Mountain. City public information officer Bryana Starbuck told the Post Independent that around 4 p.m.

Forbes contributors publish independent expert analyses and insights. David Bressan is a geologist who covers curiosities about Earth. Until now, it has been widely accepted that the fossils found in ...

John Palminteri A new bridge is going in at Cold Springs creek, after mudflow damage in 2018. (Photo: John Palminteri) John Palminteri A new bridge is going in at Cold Springs creek, after mudflow ...

The temporary bridge over the mudflow damaged section of East Mountain Drive in Montecito is now in and open. (Photo: John Palminteri) John Palminteri The temporary bridge over the mudflow damaged ...

Beverly Crest mudflow shuts down Mulholland Drive 02:17 Mulholland Drive was shut down between Deep Canyon Drive and Coldwater Canyon in Beverly Crest by a mudflow Tuesday morning. KCAL News ...

Dashcam video captured a terrifying wave of mud and debris as it barreled toward a California Highway Patrol vehicle Jan. 9 in Montecito and lifted it off the road. The video was captured in the early ...

Residents of a California neighborhood had to be rescued after Tropical Storm Hilary triggered a roaring mudflow, walloping homes and flooding streets. Videos and photos shared on social media Monday ...

An estimated 15,000 daily commuters use a stretch of Highway 101 that has been blocked for a week by mud and debris after the deadly winter storm that slammed Southern California. In the case of ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. The Los Angeles County Department of Public ...