Bijoux Trail Power Line

North Rockies

mygr8adventure , Monday 1st March, 2021 8:27PM

Snow conditions were: Crusty, Deep powder, Heavy, Wind affected. Weather conditions were: Stormy, Windy. We rode: Mellow slopes. We avoided: Alpine slopes. Riding quality was good.

Avalache Conditions: Slab avalanches today or yesterday. 30cm + of new snow, or significant drifitng, or rain in the last 48 hours. Whumpfing or drum-like sounds or shooting cracks. Rapid temperature rise to near zero degrees or wet surface snow.

Incident

Lots of snow accumulation over the weekend. Additional wind loading (cross loading) on the power over night. The snow was deep enough with a crust layer underneath that it was difficult to not get stuck on flat ground. We road across the normal bijoux trail (power line upper road way) The first persons trench was rather deep, the second and third sled to follow the same trench got caught in the slide. The slope was mellow enough to bury the sleds but cause no harm to the people or machines.

Avalanche

Avalanche was triggered while traversing along the normal bijoux trail on the power line service road. Wind loading overnight had accumulated enough snow to bury any trace of the original trail. The avalanche was trigger from down low and propagated up and across the slope in two tiers. One at 50cms depth and one at 80cms. Both layers are believed to be a storm/wind slab from recent accumulation. Two people were caught in the slide and both sleds were 98% buried. Both persons unscathed.