Northern Gallatin

Skier Triggered Slide Avalanche Gulch

Bridger Bowl
Bridger Range
Code
SS-ASc-R3-D3-I
Elevation
8000
Aspect
E
Latitude
45.81560
Longitude
-110.92300
Notes

A pair of skiers ski cut the main chute of Avalanche Gulch. It propagated widely and ran approximately 800' vertical.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
3
D size
3
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Vertical Fall
800ft
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skier Triggered Mad Man's Repeat

Bridger Bowl
Bridger Range
Code
SS-ASu-R3-D2-I
Elevation
8275
Aspect
NE
Latitude
45.81560
Longitude
-110.92300
Notes

A group skied Manman's and triggered the upper chute. When the initial avalanche hit the fan the slide propagated wider and ran "Well past the North Bowl Road"

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
u-An unintentional release
R size
3
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Vertical Fall
650ft
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skiers reported shooting cracks from their skis while ascending the terrain at Bridger Bowl. The group later remotely triggered an avalanche from 100'+ away that ran through the "Pearly Gates" and "Patrol Chute". 

Bridger Range, 2022-04-23

Shooting Cracks at Bridger Bowl

Bridger Bowl
Bridger Range
Code
Latitude
45.81560
Longitude
-110.92300
Notes

Skiers reported shooting cracks from their skis while ascending the terrain at Bridger Bowl. The group later remotely triggered an avalanche from 100'+ away. 

Number of slides
0
Number caught
0
Number buried
0
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year

Skier triggered avalanche in Sheep Creek

Sheep Creek
Cooke City
Code
SS-ASc-R2-D1.5-I
Elevation
9500
Aspect
NE
Latitude
45.03440
Longitude
-109.98400
Notes

"Ski cut on belay a SS avalanche out of the start zone of this N facing slope in Sheep Creek basin. The crown was 4-16" deep and broke into the rocks on skier's right, as well as skirted the bottom of the rock wall skier's left. Winds along the Mineral ridge were moderate gusting strong from the south with active transport observed."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
2
D size
1.5
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness
12.0 inches
Vertical Fall
650ft
Slab Width
30.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Natural large slabs on The Throne

The Throne
Bridger Range
Code
SS-N-R3-D2-I
Latitude
45.88220
Longitude
-110.95200
Number of slides
3
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
3
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness
10.0 inches
Vertical Fall
600ft
Slab Width
60.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Five skiers caught in large natural dry loose

East Rosebud
Out of Advisory Area
Code
L-N-R2-D2-S
Aspect
NW
Latitude
45.17210
Longitude
-109.65000
Notes

From one group's obs. 4/16/22: "While 3 of us were on ascent( about 2/3 height) we witnessed a large spin drift off the climbers right wall which entrained a lot of snow turning into a significant dry loose event. Our 3rd who was a little ways behind got carried to the apron. There was a 2nd party behind us just above the apron that followed us up the couloir. Their crew of 4 was carried as well. The 2 of us that weren’t carried went into search with our beacons and skied down the the apron where we found everyone on top and luckily uninjured. We never had communication or visual of the other crew on ascent until moments before the incident." 

Other group's obs. 4/17/22: "Yesterday a natural dry/loose avalanche ran in the Chamonix couloir in East Rosebud, partially burry all four people in my party and one person in a party above us. Four of the five of us were able dig ourselves out and there were no significant injuries.

We knew the area had received a lot of snow in the last week but there was only a four or five inches of fresh snow at the lake. At about 8,700 feet, when we transitioned to boot packing, there was roughly a foot of low density fresh snow that was bonded well to the existing snow. Skies were clear at sunrise, clouds moved in throughout the morning and it began snowing lightly around 11:30.

We didn't see the beginning of the avalanche, two members of the party above us said that a sluff that ran off one of the walls above them and was small enough when it ran past them that it didn't effect them. I don't know how high they were above the third member of their party but the third member was a few hundred feet above us. By the time the avalanche reached us it had grown substantially and was an over-head wall of snow. The two skiers who saw the avalanche start didn't see it step down to any deeper layers, it was just the new snow. Based on the data from my watch, we were carried about 750 vertical feet. We didn't take any photos of the slide."

Number of slides
1
Number caught
5
Number buried
0
Avalanche Type
Loose-snow avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
S - Avalanche released within new snow
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year