Date of Observation: 01/05/2022
Zone: Northwest Mountains
Route Description: Irwin Tenure
Observed avalanche activity: Yes
Avalanches: Avalanche observations: Ski Hero’s HS reactive to a single 3 # hand charge. Failed on 2-3mm DH on top of a 1F
crust. 10 cm above the ground.
HS-AE-R3-D2.5-O FC (130cm x 100m x 350m) Failed on late Oct snow
Photos:
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Explosive-triggered avalanche on westerly-facing terrain that was big enough to break a few small trees.
Estimated avalanche date: 01/04/2022
Number of Avalanches: 1
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: W
Characteristics
Trigger: Explosive
Trigger modifier:
Type: Hard Slab
Failure Plane:
Size
Relative Size: R3 medium
Destructive Size: D2.5
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
5209
