Lionhead Range

Natural and rider triggered slides at Lionhead

Lionhead Ridge
Lionhead Range
Code
SS-N-R3-D2
Latitude
44.71450
Longitude
-111.31800
Notes

On 1/26/24 we observed two avalanches at Lionhead that appeared to have broken in the last 24 hours.

One slide broke below treeline in Denny Creek, around 100 ft wide and ran around 100 vertical feet. Looked to have broke 1-2 ft deep. Recent snowmobile tracks about 50 ft away from the flank make it seem likely it was remotely snowmobile triggered. 

The other slide was larger, it broke around 600 ft wide and ran 500 vertical ft. Didn't get a good look at the crown, but would estimate it broke around 2-3 ft deep. It broke across three gullies that sometime avalanche as separate paths. 

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
3
D size
2
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Many avalanches along Lionhead Ridge

Date
Activity
Snowmobiling

Rode along Lionhead Ridge from Denny Creek to Watkins Creek and around into the head of Targhee Creek. Saw dozens of avalanches that broke within the last week. Most of the slides looked to have broken early this week with a couple looking like they broke in the last 24 hours. Slides broke on all aspects, both above treeline and well below treeline, and on both wind-loaded and nonwind-loaded slopes. Some looked to be naturals and some looked to have been rider triggered. One of the slides in Watkins Creek broke across three avalanche paths/gully features and was one of the larger slides we've seen this season, looking to have piled up debris 10+ ft deep. All these slides looked to have broken on one of the December surface hoar layers at the top of the early season facets.

Dug a pit adjacent to one of the slides in Targhee Creek and got an ECTP13 on the lower of two well defined surface hoar layers. 

Riding today it was quite dramatic how much stiffer the slab is than it was the 10 days ago. Instead of just trenching through the whole snowpack you now mostly ride on top until you dramatically break though. We got a couple of shooting cracks while approaching our snowpit site, but they were not nearly as dramatic as the cracks last week. 

Region
Lionhead Range
Location (from list)
Lionhead Ridge
Observer Name
Ian Hoyer

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Bridger Range, 2024-01-25

Multiple remote triggers, Lionhead

Lionhead Range
Code
Latitude
44.70170
Longitude
-111.36000
Notes

Multiple remotely triggered avalanches. Lots of shooting cracks and visible whomping(poofs of snow dust). 

Triggered from over 140 yards 

Number of slides
1
Number caught
0
Number buried
0
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Multiple remote triggers

Date
Activity
Snowmobiling

Multiple remotely triggered avalanches. Lots of shooting cracks and visible whomping(poofs of snow dust). 

Triggered from over 140 yards 

Region
Lionhead Range
Observer Name
Ryli schlueter