Date of Observation: 02/22/2022
Name: Irwin Guides
Zone: Northwest Mountains
Route Description: Irwin Tenure
Observed avalanche activity: Yes
Avalanches: SS-ASr-R1-D1-O W aspect BTL 10-13″ X 50′ X 150′ triggered from 50′ away (Strike
Three).
SS-ASr-R1-D1.5-O E aspect NTL 14-16″ X 150′ X 250′ triggered from the flat ridge above ( Sonic/ Pre
evac).
Numerous small D1’s W BTL
Weather:
Snowpack:
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: BTL: Below Tree Line
Aspect: W
Trigger: Skier
Trigger modifier: Remote
Type: Soft Slab
Failure Plane: Old snow
Relative Size: R1 very small
Destructive Size: D1- Relatively harmless to people
Avg. crown height (inches): 12
Avg. width (feet): 50
Avg. vertical run (feet): 150
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: E
Trigger: Skier
Trigger modifier: Remote
Type: Soft Slab
Failure Plane: Old snow
Relative Size: R1 very small
Destructive Size: D1.5
Avg. crown height (inches): 15
Avg. width (feet): 150
Avg. vertical run (feet): 250
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
