Public Field Report

Observation Date:

March 3, 2023

Submitted:

March 6, 2023

Zone or Region:

Challis Area and Lost Rivers

Activity:

Skiing/Snowboarding

Location:

Twinn Bridges Creek

Did you observe any avalanches?

Yes

Avalanche Type:

Hard Slab

Size:

Size 3: Could bury and destroy a car, damage a truck, destroy a wood frame house, or break a few trees

Elevation:

8000’

Aspect:

Comments:

Observed from a distance, crown probably 3-4’ thick, 250-300’ across, ran full length of drainage.

Did you see shooting cracks?

Yes, Isolated

Did you experience collapsing or whumpfing?

Yes, Widespread

Casual touring, aware of of the danger and traveled cautiously. Widespread whomping on moderate terrain e.g. 20-25 degrees, whomping with fracturing on 30 degree+. Lots of wind blown slabs. Traveled on ridges where it was wind impacted. Lower elevations - less wind impacted- leeward sides skied well 25degrees or less. Snow depths ranged from 2-3’ on average.

Public Field Report: Twinn Bridges Creek