Observation: Little Cottonwood Canyon

Observation Date
2/14/2025
Observer Name
Kelly
Region
Salt Lake » Little Cottonwood Canyon
Location Name or Route
Upper Little Cottonwood Canyon
Weather
Sky
Overcast
Precipitation
Light Snowfall
Wind Direction
West
Wind Speed
Moderate
Weather Comments
Overcast to broken skies with light snowfall. Winds were light to moderate blowing from the west.
Snow Characteristics
New Snow Depth
12"
New Snow Density
Medium
Snow Surface Conditions
Powder
Snow Characteristics Comments
12"-15" of new snow with deeper wind drifts. New snow was heavily rimed.
Red Flags
Red Flags
Heavy Snowfall
Wind Loading
Cracking
Collapsing
Poor Snowpack Structure
Avalanche Problem #1
Problem
Persistent Weak Layer
Avalanche Problem #2
Problem
New Snow
Snow Profile
Aspect
West
Elevation
10,000'
Slope Angle
34°
Comments
Red line marks failure plane. I got 2 extended column tests to fail with propagation while cutting at the interface of the graupel and the old snow (ECTPV x2). This occurred about 2' (65cm) from the surface. Any avalanche that breaks on this layer would be big enough to catch, carry, and bury a human (D2). This shows a very weak structure and with new snow that fell today and forecasted snow totals I would not be surprised to hear of many natural avalanches occurring throughout the range. Where I traveled today I felt collapsing on north and west aspects above 9,000'. This graupel failure plane is similar to the layer we found yesterday in Snake Creek (Northern Provo Region).
Above photo shows depth of the slab (24") on top of the dirty graupel layer.

If this layer has been loaded with wind drifted snow it will be even more suspect. I stuck to lower elevation terrain under 35° degrees and mostly traveled on terrain less than 30 ° in steepness. As much as I want to be able to have go-for-it kind of Wasatch day, I am keeping things in check with hopes that the PWL will settle out before it melts out and I'll get a chance to travel safely through the mountains this season.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
None
Coordinates