These observations document past conditions at a small and variable scale. They are not to be confused with an avalanche forecast. They come from a variety of sources. We can only vouch for the quality of those produced by the SAC forecasters and professional observers.
Date and time of observation or avalanche occurrence Location Media Observation made by
12/13/2020 - 13:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
01/16/2016 - 16:16
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Public
01/08/2023 - 11:30
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Public
02/13/2019 - 11:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Long shooting crack on storm snow instability. Natural avalanche that failed early this morning on a storm snow weakness at the beginning of the storm snow Forecaster
03/07/2021 - 13:58
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Public
01/22/2018 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Small cracking on above a ENE wind-loaded slope near the summit of AndesiteSkier-triggered pinwheels at 8000 ft. Forecaster
12/14/2019 - 13:15
Snowpack Observation 		Andesite peak
Donner Summit Area 		Educator
Tahoe Mountain Scho
12/02/2017 - 12:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Photo 1: Average height of snow near summit of AndesitePhoto 2: South Face of Castle Guide
Alpenglow Expeditio
12/26/2016 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
03/01/2020 - 12:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		A long shooting crack on an open slope loaded by NE winds. The crack goes from where the photo was taken to the person in the red jacket. Wind scouring by the NE winds Another shooting crack on a cross-loaded SE aspect in near treeline terrain Shooting crack triggered on low angle slope loaded by the NE winds in near treeline terrain 3 ft thick wind slab resting on softer storm snow on top of an old firm crust. Forecaster
03/18/2018 - 12:45
Snowpack Observation 		Andesite Peak
Donner Summit Area 		RB4 near Andesite Peak Public
03/19/2021 - 13:28
Avalanche Observation 		Andesite Peak
Donner Summit Area 		crown below cornice fall triggered Avalanche Debris Side view of crown Guide
Alpenglow Expeditio
03/30/2014 - 12:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Professional Observer
04/21/2018 - 09:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Poor snow surface refreeze on open E aspect at 7,600'. About 3 inches of weak crust on top of 3 inches of residual storm snow on top of older melt-freeze crust. Residual wet snow in the deeper snowpack. Skier triggered roller balls on mid slope avalanche path on Andesite Peak. NE aspect at 7,900' at 9:15 am. Skier triggered roller balls on the summit of Andesite Peak. NE aspect at 9:45 am. Forecaster
03/22/2018 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Shooting crack on an E - NE facing wind-loaded slope at 8100 ft. Rain runnels at 7500'. Large cornice drops did not cause wind slab failure. Heavy, wet, deep snow existed at 8200' on the top of Andesite. Forecaster

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