Assumption Risk in Snowboarding and Skiing | Mammoth Mountain

Kathleen Willhide-Michiulis was involved in a tragic snowboarding accident at Mammoth Mountain Ski Area. On her last run of the day, she collided with a snowcat pulling a snow-grooming tiller and got caught in the tiller. The accident resulted in the amputation of her left leg, several skull fractures, and facial lacerations, among other serious injuries.

A snowcat is a large snow-grooming vehicle — 30 feet long and 18 feet wide. It has five wheels on each side of the vehicle that are enclosed in a track. In front of the snowcat is a plow extending the width of the snowcat. In back is a 20-foot wide trailer containing a tiller. A tiller “spins at a high [speed] br[e]aking up the snow and slightly warming it and allowing it to refreeze in a firm skiable surface.” Mammoth strives not to have snowcats operating when the resort is open to the public; however, it may be necessary at times.

It is for the court to decide whether an activity is an active sport, the inherent risks of that sport, and whether the defendant has increased the risks of the activity beyond the risks inherent in the sport.

Although snowcats and snow-grooming tillers are capable of causing catastrophic injury, as evidenced by Willhide-Michiulis’s experience, we conclude this equipment is an inherent part of the sport of snowboarding and the way in which the snowcat was operated in this case did not rise to the level of gross negligence.

Full Opinion: http://www.courts.ca.gov/opinions/documents/C082306.PDF