Avalanche Incidents

Cooke City
Sheep Mountain
Rider-Triggered Avalanche SW face of Sheep Mountain
Incident details include images
Incident details contain video
Sheep Mountain
SS-AMu-R2-D2-O
Elevation: 9,900
Aspect: SW
Coordinates: 45.0722, -109.9280
Caught: 0 ; Buried: 0

From Obs: "On the morning of Sunday February 6, a snowmobiler triggered a slide in new snow on the SW face of Sheep Mountain. The slide triggered remotely while the rider was lower on the slope and he was not caught (the visible track is not from the rider who triggered the slide , his track was buried in the debris field). The crown was about 18" deep and 75 feet wide and the slide and the slide ran about 250 feet."


More Avalanche Details
Lionhead Range
Lionhead Ridge
Small Snowmobile Triggered Avalanche
Incident details include images
Lionhead Ridge
SS-AMu-R1-D1-I
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

From obs: "Today I watched as a sledder dropped a cornice causing the cornice to fall triggering an
avalanche chasing him down the hill. The snowpack consisted of a wind slab on top of near-surface
facets and a couple of buried layers of surface hoar ."


More Avalanche Details
Lionhead Range
Ski Hill
Fatal Avalanche Ski Hill
Incident details include images
Incident details contain video
Ski Hill
SS-AMu-R1-D2-O
Elevation: 8,100
Aspect: E
Coordinates: 44.7016, -111.2930
Caught: 1 ; Buried: 1; Killed: 1

On Sunday, one snowmobiler in a group of four was caught and killed in a small avalanche on Ski Hill at the south end of Lionhead Ridge. He was on a 45-degree slope when it released and partially buried him against a tree. The slide was only 4"-11" deep, 75 feet wide and ran 300 feet vertical. His head was a foot under the snow. The avalanche was not witnessed and the victim was buried an estimated 15-25 minutes before he was uncovered. Rescue efforts were not successful. The group was familiar with the area and had rescue gear. The shallow, steep slide ended in trees, a terrain trap . Our deepest condolences go out to the family and friends of the rider. 

A detailed report can be read here.

 


More Avalanche Details
Cooke City
Goose Lake
Partial Burial on Sawtooth Mountain near Goose Lake
Incident details include images
Goose Lake
SS-ASu-R2-D2-O
Elevation: 10,800
Aspect: SE
Coordinates: 45.1437, -109.9040
Caught: 1 ; Buried: 1; Killed: 0

This morning while ascending a line on Sawtooth Mountain (Lower Novocain) we triggered an avalanche (ASu-SS-R2-D2-O)  that caught and carried my partner an estimated 180M and partially buried him. His leg and hand were unburied and excavation of the head was done in less than 2 minutes of the incident. The avalanche only involved new snow from the last 48hrs and was triggered on a MF crust/facet combo 30cm down(formed 1/30/22). The avalanche was 30cm at its deepest and 20-30M wide and ran 250M. We were lucky to find both skis and poles a little ways downslope. No injuries were sustained.

We both agree that we were trying to outsmart the instability that was present on steeper S facing terrain and should have turned around much sooner, we were very lucky. There was 30+cm HST in favored areas and the high winds from 1/31/22 formed some sensitive windslabs in specific areas. 

 


More Avalanche Details
Cooke City
Mt Fox
Skier Triggered Wind Slab, Mt Fox
Mt Fox
SS-AS
Aspect: E
Coordinates: 45.1212, -109.9300
Caught: 0 ; Buried: 0

Skier-triggered avalanche reported on Mt. Fox. Details unknown


More Avalanche Details
Bridger Range
Playground
Human-triggered Avalanche, Playground
Incident details include images
Playground
SS-ASu-R2-D1.5-I
Aspect: NE
Coordinates: 45.8426, -110.9290
Caught: 1 ; Buried: 0; Killed: 0

From Obs: "While skiing the playground, a northeast aspect in the Bridgers, my friends and I released a wind slab . The slab released on a rollover and was approximately 20 ft wide and 6-12" deep at the top. The sl slide arried my friend about 150 ft." 


More Avalanche Details
Northern Madison
Beehive Basin
Skier triggered cornice beehive basin
Incident details include images
Beehive Basin
SS-NCu-R3-D2-O
Elevation: 9,300
Aspect: E
Coordinates: 45.3379, -111.3990
Caught: 0 ; Buried: 0

From email 1/9/21: "Skier triggered cornice failure avalanche. Broke at skis 10-12 feet from the lip. No one caught or injured."


More Avalanche Details
Cooke City
COOKE CITY
Snowmobile triggered slide outside Cooke City
COOKE CITY
SS-AMu-R2-D2
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

 

From facebook: "This morning 1/7/2022 by lower lady I set off a avalanche about 2ft deep 100ft wide just a heads up out there the new snow is not very safe!! Glad my whole group stayed low, I was up there alone digging it out when it broke loose! Stay safe ride on!"


More Avalanche Details
Cooke City
Mt. Abundance
Human-Triggered Avalanche, Mt Abundance
Incident details include images
Mt. Abundance
AMu-R3-D2-O
Coordinates: 45.0772, -110.0210
Caught: 0 ; Buried: 0

Snowmobilers riding near Mount Abundance north of Cooke City unintentionally triggered two avalanches on Dec. 27th. No one was caught or injured. 


More Avalanche Details
Cooke City
Scotch Bonnet
Double Avalanche Fatality, Scotch Bonnet Mountain
Incident details include images
Incident details contain video
Scotch Bonnet
SS-AMu-R2-D2.5-O
Elevation: 10,000
Aspect: SE
Coordinates: 45.0566, -109.9510
Caught: 2 ; Buried: 2; Killed: 2

On December 27, two snowmobilers were caught and killed in an avalanche on Scotch Bonnet Mountain, north of Cooke City. A group of 8 snowmobilers from Minnesota were on their second day of riding when 2 of their machines got stuck on the SE face of Scotch Bonnet Mountain. Two members of their group rode up to help them dig out and the avalanche was triggered soon after. It broke 4-5 feet deep, ran 300 feet wide and 500 feet vertical and killed 2 riders, burying them under 4-5 feet of debris. Everyone had rescue equipment and they were recovered by their party. Park County Sheriff Search and Rescue brought the victims to town. The avalanche broke on a layer of facets 1.5 feet off the ground underneath a thick slab of wind drifted snow. The avalanche is classified SS-AMu-R2-D2.5-O.

 


More Avalanche Details
Cooke City
Goose Lake
Snomo triggered small avalanche outside Cooke City
Goose Lake
SS-AMu-R1-O
Coordinates: 45.1153, -109.9140
Caught: 0 ; Buried: 0

A sledder triggered an avalanche on a wind-loaded slope near Goose Lake. It was maybe 75-100 feet wide but only slid 3 feet before arresting. It was on a low-angled slope and failed on facets on a rocky band. They triggered it as they were sidehilling and rode off the slab . Doug interviewed the party in Cooke City.


More Avalanche Details
Southern Madison
Bacon Rind
Remote triggered avalanche, Bacon Rind
Incident details include images
Incident details contain video
Bacon Rind
SS-ASr-R2-D2
Elevation: 8,900
Aspect: E
Coordinates: 44.9609, -111.1000
Caught: 0 ; Buried: 0

Skiers remotely triggered an avalanche in the Bacon Rind area from the flats above the Skillet


More Avalanche Details
Bridger Range
The Ramp
Small, skier triggered wind slab
The Ramp
SS-ASu-R0
Elevation: 8,000
Coordinates: 45.8289, -110.9310
Caught: 0 ; Buried: 0

My partner had a 6" deep, about 15' wide slab release roughly 40 feet beneath him about halfway up the ramp, lookers right, on a NE facing, untouched aspect . Seemed more in line with wolverine bowl aspect vs the ramp. We dug a pit just a little further up the ramp and got a little movement about 15cm's from the top of the pack but not solid enough to call it a clean break. 60-65cm total depth in our pit.


More Avalanche Details
Northern Gallatin
Hyalite - East Fork
Ice climbers triggered small avalanches in E. Fork Hyalite
Incident details include images
Hyalite - East Fork
SS-AFu-R1-D1-S
Elevation: 7,600
Aspect: NE
Coordinates: 45.4539, -110.9210
Caught: 0 ; Buried: 0

The slide was on the ice climb in Comet Alley.

From email (12/5/21) : "Small avalanche triggered while approaching ice climb in East fork of Hyalite basin. 

Another D1 natural avalanche was observed later in the day similar aspect /elevation

NE @7600’
SS-AFu-D0.5-I"


More Avalanche Details
Bridger Range
Naya Nuki Bowl
Skier caught in slough in the The Great One
Incident details include images
Naya Nuki Bowl
L-ASu-R1-D1.5-S
Elevation: 9,000
Aspect: N
Coordinates: 45.8883, -110.9590
Caught: 1 ; Buried: 0

From e-mail 11/7/21: "Today, my partner and I set out to ski The Great One, with a plan to come up and over Sac Peak and then walk the ridge to Naya Nikki before skiing the Great One into Airplane Bowl. We found more snow than expected at the TH, about 6inches. On our way up to the pass just north of Sac we noticed the characteristic wind stripping down to scree on the trail to the pass. On one of the switch backs we were able to get about an 1-2” deep wi wind slab o propagate but not move down slope. Given the depth, we didn’t put too much stock into this. We proceeded to walk the almost snow free trail over to Naya Nuki before booting down to the top of the Great One. The skiers left side of the Coul Couloir some obvious wind load and after a few ski cuts felt comfortable continuing to ski. After my partner skied the majority of the top section, I followed and was entrained and taken for a slid slide my own ‘slough’. I was carried about 40’ before I stopped, while the slough kept running for another 100-150’ arresting on the shallower angled slope before the break in the Couloir wall Couloir eeds into Airplane Bowl. The entrained width of moving snow was about 3-5’ wide. There were no injuries, and we continued down to the base of the Couloir, decid Couloir would be more dangerous to try and go back up to get out. Once in airplane bowl we saw multiple large slides that ran last night, syn-storm. Most of which came down from the East face of Sac. A few 200-300’ wide and running the length of the bowl. Early season hubris, and is not even thinking about overnight wind totals has us more or less absent minded when we set out this morning. A mistake that could’ve been a lot worse if the slough had taken a larger wind pocket with it, and carried me over the same aspect that led to aspect atality in the Great One last fall. No pictures of the slough, attached is a grainy cell phone pic of the slides in Airplane Bowl."


More Avalanche Details