Avalanche: Chugach State Park

Location: Three Bowls-South Fork Eagle River

Route & General Observations

The APU Snow Science class traveled to the Three Bowls avalanche in South Fork Eagle River to document the slide and observe the snowpack. Students toured up to 2700’ and spent time on both sides of the avalanche track (S-NW aspects). The ski conditions were a mix of crust and corn however it is not recommended to travel to this area! The snowpack contained depth hoar with moderate strength, high propagation potential, and poor structure.

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
Trigger UnknownRemote Trigger Unknown
Avalanche Type UnknownAspect Unknown
ElevationunknownSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

-The avalanche released on 03/25 as previously recorded HS-Nc-R3-D4
-Secondary avalanche released during mitigation HS-AHc-R1-D1

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?Yes
Observer Comments

Two large whumps were observed while traveling on a south aspect @2670’. The layer collapsed enough to create large shooting cracks and visibly dropped ~2cm.

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.

Scattered to broken clouds, with warm temperatures up to 4℃, and calm to light winds.

Snow surface

Sastrugi, located on a W aspect, provided evidence for easterly winds, a rare occurrence for South Fork.
5cm of melt freeze crust on southerly and west aspects up to 2,700’
Very thin covering of melt-layer recrystilization facets (near surface facets) on W aspects.


3 Bowls: @2670’/S aspect/35° slope angle/HS 67cm/ @12:45
-PST 25/100 END @18
-ECTP11 SP @18
-Layer of concern ground to 18cm 4mm facets & depth hoar 4 lemons
-Layer showed moderate strength and high propagation potential with poor structure
- For full profile see picture

3 Bowls: @2500’/W aspect/25° slope angle/HS 125cm/ @14:45
-CT23 SP @ 38 on 4mm depth hoar

Photos & Video
Please upload photos below. Maximum of 5 megabytes per image. Click here for help on resizing images. If you are having trouble uploading please email images separately to staff.