Observer Name
Grainger
Observation Date
Thursday, March 6, 2025
Avalanche Date
Thursday, March 6, 2025
Region
Salt Lake » Big Cottonwood Canyon » Cardiff Fork » Reed and Benson Ridge
Location Name or Route
Reed and Benson Ridge
Elevation
9,800'
Slope Angle
38°
Trigger
Skier
Avalanche Type
Soft Slab
Avalanche Problem
New Snow
Weak Layer
New Snow/Old Snow Interface
Comments
Widespread natural dry-loose and (very) soft slab activity was visible throughout Days and Cardiff from Wednesday night's storm (Pic 4). These ran either on a density change within the storm snow or on the Tuesday/Wednesday interface and had very little in the way of slab formation.
Skis easily triggered storm snow on all aspects (Pic 5) with light to moderate SW winds forming soft windslabs isolated to the highest N and E-facing (lee) sides of ridges (Pic 6). Terrain influence also funneled wind and slabbed some of the S and W facing terrain features.
The long-running nature of this medium-density dry-loose snow throughout Days from Chicken Sh*t Ridge through Upper Days differed from the west-facing Cardiff. I triggered the only notable slide of the day from close to the main ridge in Benson & Hedges (clear visual of the runout, no humans). The hardened bed surface and wind effect contributed to this SW-facing slide being more slabbed and longer-running, 1100' vertical and touching the historic trim line (Pic 1). Only involving the last 24 hours' storm snow, heights of crown and flanks varied from 8-24" (Pic 2 &3). 30-55' width, small D2.
As snow continues my take away is that Monday/Tuesday snow has bonded decently in many areas to the M/F crust layer from last week. This recent snow will continue to settle and stabilize but wind-affected areas will create slabs that if triggered, will entrain snow under them. South and West faces will see more wind-slabbing and it will take longer to feel good about the crust/storm interface on these aspects.






Coordinates