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. This program is available as a free download at A video on how to download and use this program is available here. Please send us your observations using the buttons below.

Location Region Observation Type Date and time of observation or avalanche occurrence Avalanche observation video Avalanche photos Snowpit videos (tests, etc) Snowpack photos Snowpit or crown profile photo or graph Observation made bysort descending
Castle Peak Donner Summit Area Snowpack Observation 11/09/2017 - 12:00 Cornice sections above test slopes easily collapsed with intentional efforts. No signs of wind slab instability revealed on the test slope below. Supportable snow cover at ~7,900' between the Grub Hut and Castle Pass. Forecaster
Rubicon Peak West Shore Area Snowpack Observation 11/15/2017 - 08:30 Large exposed anchors (aka rocks, stumps, logs, etc) on a north aspect at 8600 ft 55 cm deep snowpack consisting of moist new snow and moist larger grained old snow near the bottom. Snow coverage at 7500 ft. Snow coverage at 7200 ft. Forecaster
Barker Peak Blackwood Canyon or Ward Canyon Area Snowpack Observation 11/07/2017 - 11:30 Snowpit location N aspect snowcover of 11 inches at ~8,000'. Forecaster
Hourglass Bowl Mount Rose Area Avalanche Observation 11/16/2017 - 09:00 Forecaster
Castle Peak Donner Summit Area Snowpack Observation 11/14/2017 - 13:00 Snowpit location. Forecaster
East Ridge of Relay Pk Mount Rose Area Snowpack Observation 11/03/2017 - 11:00 Up to 10cm (4in) of old snow facets with thin surface crust. Numerous interruptions/discontunities of the basal layer. Faceted snow from underneath 0.5-1 cm thick surface melt-freeze crust. Forecaster
Castle Peak Donner Summit Area Snowpack Observation 11/22/2017 - 10:30 Icy crusts on the northerly aspects that ranged from breakable to supportable. Breakable rain crust and rain runnels in a meadow at 7800 ft. Forecaster
Silver Peak Cabin Creek, Deep Creek, or Pole Creek Area Snowpack Observation 11/13/2017 - 13:00 Fairly thin snowcover on N aspect at 7,800'. Anchors negated. Deepening snowcover on N aspect at 8,000'. Anchors negated. Forecaster
Incline Lake Pk and points to the NW. Mount Rose Area Snowpack Observation 11/21/2017 - 23:15 ESE aspect at around 8,600', ~12:30pm. Forecaster
East Ridge of Relay Pk Mount Rose Area Snowpack Observation 11/15/2017 - 12:00 Snowpit location as noted on map. 15 in of total snow depth. Forecaster
Lincoln Ridge Yuba Pass Area Snowpack Observation 11/08/2017 - 11:15 Snowpit location with 50cm snow depth, some previous wind loading. Snowcover of about 14 inches at about 7,350' FS Rd 12 at 6,900'. Rd plowed for logging operations. Forecaster
Tamarack Peak Mount Rose Area Snowpack Observation 11/17/2017 - 12:00 Forecaster
Relay Peak Mount Rose Area Snowpack Observation 11/19/2017 - 12:00 Forecaster
Castle Pass/Andesite Ridge Donner Summit Area Snowpack Observation 11/04/2017 - 11:00 10 to 12 in of new snow on the Castle Rd at 7,400'. Base of Casltle Pass, 12 in of new snow on bare ground. New snow right side up. Andesite Ridge ~8,000', 14 inches of new snow. Andesite Ridge ~8,000', minimal wind transport. Forecaster
Tamarack Peak Mount Rose Area Snowpack Observation 11/13/2017 - 12:00 Numerous rocks still visible in the start zones of the far east ridge of Tamarack. Some small gullies did have continuous snow coverage with weak snow near the base. 20 to 3 cm of snow on a N aspect at 9700 ft. Some facets existed at the bottom. Looking at the Hourglass and Proletariat from a distance Forecaster


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