The Sierra Nevada avalanche is the deadliest in the United States since 1981, with rescue work hampered by brutal weather and persistent avalanche danger.

A temporary flight restriction over the site remains in effect through Sunday afternoon, prohibiting drones and unauthorized aircraft.

The victims include six women who were close friends and experienced skiers, along with three professional guides; six other trip members survived.

All nine avalanche victims in California's Sierra Nevada have been recovered, according to Nevada County Sheriff Shannan Moon.

Authorities emphasize ongoing safety concerns and measures as crews assess and reduce avalanche risk while completing the recovery operation.

Rescue and mitigation efforts involve multiple agencies and organizations, including air operations from the California Highway Patrol, Nevada County Sheriff's search and rescue, Tahoe Nordic search and rescue, Pacific Gas & Electric, and the Sierra Avalanche Center.

The avalanche site, about the size of a football field, required targeted mitigation and rescue work, including using water to break up snowpack to reduce instability before further recoveries.

Eight bodies were recovered on Tuesday, with a ninth found and recovered on Saturday following a Black Hawk helicopter mission to the avalanche site.