Avalanche Incidents

Cooke City
Fisher Mtn.
Remote triggered deep slab, Fisher
Incident details include images
Incident details contain video
Fisher Mtn.
HS-AMr-R3-D2.5-O
Elevation: 10,000
Aspect: NE
Coordinates: 45.0661, -109.9590
Caught: 1 ; Buried: 0

On Dec 9, 2022 around 1:30pm we triggered a large, deep slab avalanche while riding across a lower angle slope below. This occurred on Fisher Mtn. near Cooke City on an east-northeast aspect at 10,000'. It broke 3-6+' deep and 300' wide. One rider was caught and carried, not buried, and luckily nobody was injured.


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Cooke City
Henderson Mountain
Rider Triggered Avalanche, Chimney Rock
Incident details include images
Incident details contain video
Henderson Mountain
HS-AMu-R2-D2-O
Elevation: 9,800
Aspect: NW
Coordinates: 45.0524, -109.9450
Caught: 0 ; Buried: 0

There was a human-triggered avalanche near Chimney Rock on Henderson Mountain. The avalanche failed on weak snow near the ground. We believe a snowmobiler triggered the slope.

From GNFAC visit to crown 12/8: "We rode to Daisy Pass to look at the avalanche that was triggered by a snowmobiler two days ago (12/6/22). It was on the slope east of the pass that people often climb up and out, steeper than the normal route out. It broke 2-3 feet deep and 250-300’ wide, R2-D2. At the crown it broke on a weak layer about 100cm above the ground, but it broke closer to the ground in many places lower on the slope where the snowpack was shallower and weaker. I would guess one of those areas is where it was triggered from."


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Bridger Range
Ross Peak
Two skiers caught in avalanche on Ross Peak
Incident details include images
Ross Peak
SS-ASu-R2-D1.5
Elevation: 8,500
Aspect: SE
Coordinates: 45.8586, -110.9560
Caught: 2 ; Buried: 2

Two skiers triggered an avalanche while ascending the Banana Couloir on Ross Peak on the morning of 12/5/22. The skiers were approximately 150 ft from the top of the couloir. The avalanche broke 20 ft above the upper skier. The slide broke in wind drifted snow 6 inches deep and approximately 30 ft wide, across most of the couloir. The lower skier was waiting in a "safe spot on the side" but was also caught by the slide. The slide ran ~600 vertical feet, pulling out a deeper pocket of snow (1.5-2 ft deep) midway down the path. Both skiers were fully submerged as they were carried, but ended up partially buried near the toe of the debris. One skier had snow packed into his mouth and underneath his eyelids. They returned to the trailhead under their own power. 


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Bridger Range
Bridger Bowl
Skier triggered avalanche NE aspect Bridger.
Incident details include images
Bridger Bowl
HS-ASu-R2-D1.5-I
Elevation: 7,800
Aspect: NE
Coordinates: 45.8264, -110.9290
Caught: 1 ; Buried: 0

From obs: "Triggered a small(d1r1?) wind slab off the bridger chair in bounds at bridger. Little skiers right of bumble chute on the roll over skiers left of bronco. NE face. Rollover around 35 degrees mellowing throughout the run. The face had tracks from earlier today before i triggered the slide. I was able to self arrest and stop myself before being carried. The crown was around 20-25 ft wide and the slide ran roughly 100ft downhill before stopping. Both myself and my partner skied away unharmed."


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Bridger Range
Bridger Bowl
Human-Triggered Avalanche In Bridger Gully
Incident details include images
Bridger Bowl
SS-ASu-R2-D1.5-I
Elevation: 7,650
Aspect: E
Coordinates: 45.8156, -110.9230
Caught: 1 ; Buried: 0; Killed: 0

From IG Message: "I read the avalanche report this morning and felt comfortable skiing. we made a plan to ski Bradley’s Meadows but ended up skiing Bridger Gully to the 3 Bears after discussion and feeling comfortable and confident in the snowpack. we did not experience any whoompfing or have any other concerns on the approach. 

The bottom of Bridger Gully to 3 Bears is where I triggered the avalanche. My partner dropped in first and skied safely out of the potential slide area. I followed up and on my first turn, triggered the slide. To me it looked like it was around 8” deep and was around 15’ wide at the crown.

My partner had eyes on me the entire time as the slide carried me about 40-45 yards. I was on top the entire time and was able to ski out at the end. I suffered no injuries. 

We skied out and talked to other skiers about our experience."


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Bridger Range
Bridger Bowl
Small avalanche Lower Nose
Incident details include images
Bridger Bowl
SS-R1-D1-I
Elevation: 7,500
Aspect: E
Coordinates: 45.8156, -110.9230
Caught: 0 ; Buried: 0

Skiers at Bridger Bowl observed a small avalanche that was likely human-triggered on the Lower Nose. New snow and wind combined to created instabilities on slopes. The ski area is closed and represents a backcountry snowpack until the ski patrol begins avalanche mitigation in preparation for the opening. 


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Bridger Range
Bradley Meadow
Wind Slab triggered on Bradley’s Meadow
Incident details include images
Bradley Meadow
HS-ASu-R1-D1-I
Elevation: 7,800
Aspect: E
Coordinates: 45.8322, -110.9280
Caught: 0 ; Buried: 0

"... a small wind slab avalanche (R1 D1)  from yesterday at approximately 7800 feet on the northern end of bradleys meadow. The slide was initiated by the second skier and although the rest of the slope was <30 degrees the starting zone was a NE facing steep cross loaded wind pillow just below the ridge. 

As my friend was skiing down he saw a crack propagate up and to his left and was able to stop on the side of the path as the snow ran past him. The  crown was approximately 30-40 feet and ran about 100 feet. 

Here are the coordinates of  a way point I dropped just above the top of the slide

45° 50.0218′ N, 110° 55.7420′ W

 we circled back and took a photo of the top as well...  "


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