Please remember that these observations indicate what was going on in the snowpack at a single point in time and space. They may not represent conditions where you are or where you plan to be. They also come from a variety of sources. SAC cannot vouch for the quality or accuracy of any observations that come from the general public. Some of these may be professional quality observations; some may not. Please use observations listed on this page as part of your information gathering process, but as always don't make decisions based on a single piece of information.

If you are looking for more information on how to understand the information on this page, all of the pit data graphs and stability tests are part of what is presented in a Level II avalanche class that follows the American Avalanche Association (AAA) or American Institute for Avalanche Research and Education (AIARE) curriculum guidelines. All of the coding and abbreviations for data presented follows the publication Snow, Weather, and Avalanches: Observational Guidelines for Avalanche Programs in the United States (SWAG) which is the standard for all professional avalanche programs in the US. An electronic copy is available here. Most of what you are looking for is in Chapter 2 and Appendix F part 1. We use a program called SnowPilot to create the snowpit graphs. It is available as an online tool or as a downloadable program at This website also has a quick video and user guide on how to use create snowpits. Please send us your observations using the buttons below.

Date and time of observation or avalanche occurrence Location Region Observation Type Photos Snowpack, Avalanche, Weather Videos Snowpit videos (tests, etc) Observation made by
03/11/2018 - 11:30 Chickadee Ridge Mount Rose Area Snowpack Observation Public
03/16/2018 - 14:00 Powderhouse Peak Luther Pass Area (including Job and Freel) Snowpack Observation One of the few test slopes that produced slab results. Professional Observer
03/19/2018 - 11:30 Basin peak Donner Summit Area Avalanche Observation Public
03/24/2018 - 11:00 Incline Lake Peak Mount Rose Area Snowpack Observation Large cornices along summit ridge. Note the cracked settlement cones on the trees. One of at least a half dozen storm slab avalanches that occurred in this area on March 22. Snowpit tests in the crown indicated that the weak layer was no longer reactive. Cracked settlement cone below treeline. Forecaster
03/26/2018 - 11:00 Hidden Peak West Shore Area Avalanche Observation Public
03/31/2018 - 14:30 Donner Peak Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
04/11/2018 - 12:00 Chickadee Ridge Mount Rose Area Snowpack Observation 1 to 3 cm of corn snow on top of a supportable melt-freeze crust at 11:30 am Widespread cloud cover rolling in across the Sierra Crest ahead of tonight's storm Forecaster
04/20/2018 - 11:30 Castle Peak Donner Summit Area Snowpack Observation Small loose wet activity on E aspects at 10:30am at 8000'. Up to 4-6'' of transitional snow on many NW-N-NE aspects.  Mostly ski supportable but not boot supportable. Minor wind scouring on N aspects from recent NW winds. Guide
Tahoe Mountain School
02/25/2018 - 11:00 East Ridge Relay Peak Mount Rose Area Snowpack Observation Near surface facets buried under recent storm snow at pit location.  N aspect, 9600', NTL terrain. Wind textured snow surface at 9600', N aspect, just off ridgeline. E aspect wind effected snow at 9600'. Forecaster
02/27/2018 - 14:15 Between Castle Pass and Round Valley Donner Summit Area Snowpack Observation Guide
Tahoe Mountain School
03/03/2018 - 10:45 Schallenberger ridge avalanche Donner Summit Area Avalanche Observation Public
03/04/2018 - 02:30 below Echo Peak, above Angora Lake Echo Summit Area Avalanche Observation Public
03/10/2018 - 10:15 Negro Canyon Mount Rose Area Snowpack Observation These once faceted snow grains have now become large rounded grains. Obvious runnel indicating drainage in the snowpack. Forecaster
03/12/2018 - 08:15 Highway 431 - Mt Rose Highway Mount Rose Area Snowpack Observation Public
03/18/2018 - 12:15 Rose BC - Mt Houghton Mount Rose Area Avalanche Observation Public


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