Avalanche: Hatcher Pass

Location: Arkose Ridge/ Pk 5100

Date:
Observer:
Allen Dahl
Route & General Observations

Managed to link up the 3 bowls East of Delia creek.
Very large cornices.

Illegal snow machine activity in the valley system south of USGS “Lonesome Mine.”

Avalanche Details
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Trigger UnknownRemote Trigger Unknown
Avalanche Type UnknownAspect Unknown
ElevationunknownSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Lots of wet loose activity on sunlit slopes, initiating off rocks.
Semi-recent slab avalanches on Divide Ridge, 2 side by side. South aspect, ~3000’.
Recent slab avalanche 1 ridge east of USGS “the knob.” East aspect, ~3750’, 1-2’ crown, ~150’ wide. Possible remote trigger, the debris covered tracks below. Unfortunately no photo.
Sluffing in steep + shaded terrain.
Evidence of prior cornice collapse in north bowl of pk 5100.

Weather & Snow Characteristics
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Weather

Blue, sunny, mostly calm at ridge tops, cold in shade.

Snow surface

Powder, faceting in certain places, very slight wind texture, suncrusts

Photos & Video
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Slab avalanches on Divide Ridge of Idaho peak.  

Radiation Recrystalization. Found in oblique Sunlit, high elevation terrain.  

Monster cornice on pk 5100.  

Illegal Snowmachine activity NE of pk 5100.  

Illegal Snowmachine activity.  

Approximate location of recent slab avalanche, NE aspect, ~3750’, 1-2ft deep, ~150’ wide  

Location
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