Technology and Science03 April, 20261 min read
Sierra Avalanche Center Report Blames Guides for Deadly Castle Peak Avalanche
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Guides led a group into avalanche terrain under dangerous conditions; nine of 15 died. Castle Peak near Lake Tahoe; this avalanche is the deadliest in modern California history.
Report Criticizes Guide Decisions
The Sierra Avalanche Center concluded the guides made key decisions that increased risk. The group of 15 was traveling below avalanche terrain but through a runout zone during a period when avalanches were likely to very likely.
The group's size contradicted best practices to minimize avalanche exposure. Seven of the 15 were killed despite wearing avalanche airbag backpacks, which were never deployed.
Failing Airbags and Equipment Malfunctions
Some victims wore avalanche airbags that did not deploy. An equipment problem with a ski binding likely saved the lives of four survivors who fell behind the group. The Nevada County Sheriff’s Office launched a criminal investigation into possible negligence.
Record Snowfall and Hazardous Conditions
The report documented one of the most dangerous snowpack configurations in half a century. Over 110 inches of snow fell during a single storm.
Wind speeds reached 75 mph with gusts up to 125 mph near the site. The group traveled below avalanche terrain but through the runout zone of an avalanche path.