Observer Name
John Janson
Observation Date
Friday, March 8, 2013
Avalanche Date
Friday, March 8, 2013
Region
Uintas » Bear River Ranger District » East fork of Bear » Boundary Creek
Location Name or Route
Boundary Creek Yurt near Lilly Lake
Elevation
9,500'
Aspect
West
Slope Angle
45°
Trigger
Skier
Trigger: additional info
Unintentionally Triggered
Avalanche Type
Hard Slab
Avalanche Problem
Persistent Weak Layer
Weak Layer
Density Change
Depth
3'
Width
400'
Vertical
600'
Snow Profile Comments
Many weak unsupported layers - one inch new
Comments
We approached the slide area via an existing track. Passed a snow pit that showed the many weak layers. The track passed near what we all knew to be a slide area just a little further south. Our weight made the hard layer collapse and radiate toward the slide are which broke loose with significant speed, noise, popping and cracking. The slide traveled out of our sight down the mountain and stopped about 150 due south of the BC yurt. It had widened to several hundred yards at the bottom and the deposition area was over 6 feet. Very powerful avalanche!