Avalanche: Hatcher Pass

Location: West of Summit Lake, Willow side.

Route & General Observations

Info and photos relayed to CNFAIC for posting on Obs page:

Snowmachine-triggered avalanche. About 200 yards south of the hatcher pass trail half a mile west of summit lake. We were riding back down from the higher elevations trying to find a place to cross willow creek. Came down a Ridge to the gully adjacent to the creek. Decided it was a bad place to cross so went to turn around and head back up when my buddy carved close to the edge of the gully when the slope broke off below him. The sled went over but he fell off and landed right at the edge of the crown. West facing slope probably ranged from 25-40 degrees depending which spot. It was really windloaded with the crown ranging from 6-10ft deep. If I had to guess it was about 600′ wide. You can kinda see in the pics where it propagated around a terrain feature to the lower angle slope that didn’t slide. We were there for about an hour while 2 of us dug his sled out, and two kept a look out in case the other slope went as it was pretty bad terrain trap.

Pics were taking right after it happened. About 1430 on Sunday (Jan. 29th).

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 SnowmachinerRemote Trigger0
Avalanche Type Hard SlabAspect West
ElevationunknownSlope Angle 40deg
Crown Depth8ftWidth 600ft
Vertical Rununknown  
Avalanche Details

6-8' deep
Approx 600' wide
Hard slab.

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?No
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?No
Observer Comments

Lots of whumphing observed in lower elevations.

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.