Date of Observation: 12/11/2021
Name: Zach Guy
Zone: Northwest Mountains
Route Description: Huge thanks to West Elk Air for getting the CBAC team views of the carnage. These photos are from the Ruby Range.
Observed avalanche activity: Yes
Avalanches: Widespread large avalanches on most aspects above treeline. The most activity was on leeward aspects (NE, E, and SE).
Photos:
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Owen S,SE ATL
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Owen East face
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Hancock E/NE ATL
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Afley and OBJ, NE ATL
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Anthracite Creek, S and SE ATL
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West side of Augusta
Estimated avalanche date: 12/10/2021
Number of Avalanches: 5
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: SE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Owen and Purple
Estimated avalanche date: 12/10/2021
Number of Avalanches: 3
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Owen
Estimated avalanche date: 12/10/2021
Number of Avalanches: 4
Location
Location: Oh-Be-Joyful Basin
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: NE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Afley (D2.5), OhBeJoyful, Purple, and Hancock
Estimated avalanche date: 12/10/2021
Number of Avalanches: 1
Location
Location: Anthracite Creek (West side of Ruby Range, Marcellina)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: W
Characteristics
Trigger:
Trigger modifier:
Type:
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Bitchmond
Estimated avalanche date: 12/10/2021
Number of Avalanches: 3
Location
Location: Anthracite Creek (West side of Ruby Range, Marcellina)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: S
Characteristics
Trigger:
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
5070
