Arrastra Creek
Out of Advisory Area
Code
HS-N-R4-D3-O
Elevation
10200
Aspect
SE
Latitude
45.26430
Longitude
-110.61700
Notes
From email: "Saw this recent crown while xc skiing out above Mill Creek today. It's on the east-southeast aspect of Peak 10526 east of Emigrant Peak at ~10,200'. In what I like to call the Arrastra Ridge Avalanche Observatory Plot*. The photo is taken approximately 5 miles in line of sight from the crown. It is roughly 1000' wide. If I had to guess, the crown is 10'+ tall—definitely a very destructive avalanche. I won't venture a guess on the rating. I'd bet good money it ran all the way to the lake at the head of Burnt Creek and rearranged some timber.
*If one wanted to create a laboratory for observing large, regularly occurring naturally triggered avalanches, this would be one of the best locations in SW MT."
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
4
D size
3
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
120.0 inches
Slab Width
1000.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year