Date of Observation: 03/05/2023
Name: Irwin Guides
Zone: Northwest Mountains
Route Description: Irwin Tenure
Observed avalanche activity: Yes
Avalanches: Candy’s SS-ASc-D1-I 8-10″ X 30′ X 200′ MFC E aspect NTL
Pre-E SS-AE-D1- I 8-10″ X 40′ X 150′ MFC E NTL
NC SS-ASc-D1-I. 6-8″ X 40′ X 150′ MFC SE NTL
Weather: From 2100-1100 the winds averaged in the mid 40’s from the SW with several gusts in the 60’s-70’s topping out at 87 last night.
Snowpack: A few wind slabs on E NTL reactive to ski cuts, some quality breaker wind board on W N/ATL, and some nice pow stashes in the safe places down low amongst the forest creatures.
Estimated avalanche date: 03/05/2023
Number of Avalanches: 1
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: E
Characteristics
Trigger: Skier
Trigger modifier: Controlled
Type: Soft Slab
Failure Plane: New/Old interface
Size
Relative Size: R1 very small
Destructive Size: D1- Relatively harmless to people
Avg. crown height (inches): 10
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Candys
Estimated avalanche date: 03/05/2023
Number of Avalanches: 1
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: E
Characteristics
Trigger: Explosive
Trigger modifier:
Type: Soft Slab
Failure Plane: New/Old interface
Size
Relative Size: R1 very small
Destructive Size: D1- Relatively harmless to people
Avg. crown height (inches): 10
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Pre E
Estimated avalanche date: 03/05/2023
Number of Avalanches: 1
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: SE
Characteristics
Trigger: Skier
Trigger modifier: Controlled
Type: Soft Slab
Failure Plane: New/Old interface
Size
Relative Size: R1 very small
Destructive Size: D1- Relatively harmless to people
Avg. crown height (inches): 10
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: NC shooter
6072
