The ski resort Mammoth Mountain shut down all lift operations on Friday, Feb. 14, after an avalanche slid on Lincoln Mountain, a popular area known for steep tree skiing and chutes, according to the ski resort’s website.

Mammoth Mountain Ski Resort announced Friday that two patrol staff were caught in an avalanche on Lincoln Mountain. The event occurred during avalanche mitigation work, following the significant snowpack.

Two ski patrollers at Mammoth Mountain, California, were caught in an avalanche at approximately 11:30 a.m. today after roughly six feet of snow fell in 36 hours, according to a statement shared by the ski resort.