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
03/19/2021 - 13:20
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Public
04/09/2018 - 08:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Open areas between 7,200' and 8,200' held a refreeze of the top 4 to 6 inches of the snow surface at 8:00 am. Snow surface in melt phase on E aspect at 7,540' at 8:30 am. Forecaster
03/31/2013 - 10:15
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
12/08/2016 - 11:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
01/15/2017 - 13:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Guide
Tahoe Mountain Scho
02/10/2019 - 02:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Forecaster
01/20/2017 - 15:45
Avalanche Observation 		Andesite Peak
Donner Summit Area
D2 Wind slab avalanche triggered by a small cornice piece
Small avalanche triggered by a larger piece of cornice
Cracking in the storm snow on in below treeline terrain
 Forecaster
01/06/2016 - 10:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
04/07/2017 - 12:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Shooting cracks on wind loaded ridgeline near peak. 8200', E aspect.Wind loading with large built out cornices along upper ridge.ECTN's with no propagation in wind loaded terrain, 8100', E aspect. Forecaster
04/06/2022 - 10:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Good coverage and smooth surfaces exist on open E facing aspects on Andesite Ridge. 1-2 inches of soft wet corn snow had formed on the E aspects by 10:30 am. These slopes also still had a supportable 6-8 in thick frozen melt freeze crust below the wet surface snow. Very uneven snow surfaces existed in some areas. More dirt and debris continues to appear as the snow melts. Lots of dirt showing on the SW side of Castle Peak. Impressive amounts of debris exist on the snow surface in wooded areas. Forecaster
02/03/2016 - 10:00
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
03/25/2020 - 11:00
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Small D1 wind slab avalanche intentionally triggered. Propagation of wind slab to right flank. Small wind slab failure on small test slope. 8-10'' wind slabs failing on a buried graupel layer. Small loose dry sluffing on slopes >35 degrees. Forecaster
04/17/2022 - 10:30
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Large pinwheel approaching 3 feet in diameter. Rime crust at 7,200'. Rime on trees near the summit at about 8,200'. Mix of supportable crust and deeper wet snow at 9:30 am on S aspect terrain at 7,300'. Forecaster
01/08/2014 - 10:55
Snowpack Observation 		Andesite Peak
Donner Summit Area 		Forecaster
03/25/2018 - 10:30
Avalanche Observation 		Andesite Peak
Donner Summit Area 		Natural wind slab below the summit of Andesite, E aspect, ~8,200'. Appeared to have occurred late on March 24. 6 inches of storm snow available for wind transport in above treeline areas. Dark line is our skin track. Minor cracking on wind loaded test slope above treeline. Forecaster

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