Bonnie Moraine

Snowpack

Depth

370

Obs Type

point

Site Aspect

NW

Test Fracture

sudden

Site Elevation

2004

Ski Penetration

3

Foot Penetration

20

Test Failure Depth

20

Site Elevation Band

alp

Surface Conditions

surfaceHoar, crust

Test Failure Layer Crystal Types

stormSnow

Pit depth: 120 cm Total snow depth: ~370 cm (120 cm pit depth plus ~250 cm below pit) Snowpack structure: • 0–10 cm: Old storm crust • 10–20 cm: Second storm crust, more consolidated • Below 20 cm: Generally consistent, right-side-up snowpack to ground Stability tests: • CT: • CT7 (E) @ ~20 cm on second storm crust • Additional failure on second storm crust with shoulder taps • Deeper failure: • After continued hard shoulder taps, a sudden planar shear occurred at ~95 cm • Failure produced a large slab release with a clean shear plane Travel and surface conditions: • Skiing quality was very good overall. Snow was creamy on descent with minimal crust at higher elevations. • Lower in the trees, the crust became more pronounced and grabby. Comments: The second storm crust remains reactive to light loading. A deeper weakness at ~95 cm shows potential for large, high-consequence slab avalanches under sufficient loading. Surface crust characteristics varied with elevation, becoming more influential in treed terrain.