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Avalanche: Rainbow Peak

Observer Name
Berin Klawiter
Observation Date
Saturday, March 11, 2023
Avalanche Date
Saturday, March 11, 2023
Region
Salt Lake » Little Cottonwood Canyon » Red Pine » Rainbow Peak
Location Name or Route
Rainbow Ridge
Elevation
8,800'
Aspect
Northeast
Trigger
Snowboarder
Trigger: additional info
Intentionally Triggered
Avalanche Type
Soft Slab
Avalanche Problem
Wind Drifted Snow
Depth
4"
Width
25'
Vertical
400'
Comments
Our party broke trail up Pink Pine Ridge to Rainbow Peak. Snow felt very stable until we reached the ridge where some windblown snow was coated with a layer of graupel. From the ridge we set the remaining boot pack to the top of rainbow peak. Along the way, the top 4 inches of new snow showed signs of instability (cracking, blocking) on the windward side of the ridge. Knowing there would be a good chance of a wind slab over graupel on Rainbow Peak chute I cut the top of the slope. This cut released an avalanche that slide the entire length of the chute. After cutting the slope I entered a island of safety to the right of the slope as the avalanche passed by. Only once the slide settled did I continue cautiously to the bottom.
I think this episode shows the importance of identifying zones of safety before riding through avalanche terrain and cutting the top of a slope before entering the terrain below. While zones of safety and slope cuts are NOT a solution in avalanche terrain they do play a small part in mitigating risks. Please ride safely out there.
Coordinates