A snowmobiler was climbing a hill and he got stuck. A second sledder parked below and was walking up the track of his stuck buddy. A third climbed up and was a little higher than the stuck sledder when the slab released. The sledder that triggered the slide was able to grab the throttle and out run the avalanche. The other two were caught. The original stuck rider reported that he was doing backstroke swimming motions to help keep above the surface. He briefly submerged but popped up again. The rider that was walking up the sled track was caught, carried a short distance and buried to his waist. Everyone ended up uninjured and rode home.
There were very large chunks in the debris since the avalanche didn't run very far.
The crown face ranged from 3 to 5 feet deep.