Date of Observation: 01/28/2023
Name: Irwin Guides
Zone: Northwest Mountains
Route Description: Irwin Tenure
Observed avalanche activity: Yes
Avalanches: Widespread Touchy Storm Slabs to D1 near and below TL
Weather: OVC, Hi 17/8, WSW 10-25 g30-50, S-1 to S2
Snowpack: Widespread Touchy Storm Slabs reflective of our 16″ HST plus or minus wind transport, limited to D1 in size. There was significant wind transport near and above TL.
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: W
Trigger: Skier
Trigger modifier: Controlled
Type: Soft Slab
Failure Plane:
Relative Size:
Destructive Size: D1- Relatively harmless to people
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: BTL: Below Tree Line
Aspect: W
Trigger: Skier
Trigger modifier: Controlled
Type: Soft Slab
Failure Plane:
Relative Size:
Destructive Size: D1- Relatively harmless to people
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
# 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: SE
Trigger: Skier
Trigger modifier: Controlled
Type: Soft Slab
Failure Plane:
Relative Size:
Destructive Size: D1- Relatively harmless to people
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
