Trip Planning for Cooke City Area

On Jan. 9 we rode away from our snowpit on Mt. Abundance we saw a fresh 3'deep x 10' wide slide that we might have remote triggered from the flat ridge above.

Jan. 9, About 45 minutes after we left a snowpit on Mt. Abundance, from a couple miles away, we saw a 4-6' deep avalanche that happened since we had been there, about 1000' up the ridge from our snowpit m. This slide was either natural or remote triggered by riders about 1000' away who were there after we were. Photo: GNFAC

Jan. 9, About 45 minutes after we left a snowpit on Mt. Abundance, from a couple miles away, we saw a 4-6' deep avalanche that happened since we had been there, about 1000' up the ridge from our snowpit m. This slide was either natural or remote triggered by riders about 1000' away who were there after we were. Photo: GNFAC

On Jan. 9 we saw this large avalanche on the north side of Fisher Mtn. that happened at some time in the last week (could have been 48 hours to a week old). Photo: GNFAC

On Jan 9, we saw one 3-4' deep slide that looked like it broke within recent new and wind-drifted snow on the north end of Henderson. Photo: GNFAC

There were a couple of avalanches on E Henderson, one that I think happened today, a few on E Sheep Mountain, some shallower avalanches, and plenty of loose dry snow moving around in the steeps. Photo: N Mattes 

There were a couple of avalanches on E Henderson, one that I think happened today, a few on E Sheep Mountain, some shallower avalanches, and plenty of loose dry snow moving around in the steeps. Photo: N Mattes 

There were a couple of avalanches on E Henderson, one that I think happened today, a few on E Sheep Mountain, some shallower avalanches, and plenty of loose dry snow moving around in the steeps. Photo: N Mattes 

There were a couple of avalanches on E Henderson, one that I think happened today, a few on E Sheep Mountain, some shallower avalanches, and plenty of loose dry snow moving around in the steeps. Photo: N Mattes 

There were a couple of avalanches on E Henderson, one that I think happened today, a few on E Sheep Mountain, some shallower avalanches, and plenty of loose dry snow moving around in the steeps. Photo: N Mattes 

3-4 foot crown about 100 yards wide on East face of sheep mountain. Photo: Mike F

3-4 foot crown about 100 yards wide on East face of sheep mountain. Photo: Mike F

On Jan 2, 2025 we saw three avalanches just north of Daisy Pass and one on Henderson Mtn. The one on Henderson was difficult to see the crown, but we could see the debris. Two of the slides north of Daisy were 2-3' deep and 100-150' wide and ran into thick stands of trees, looked like thick soft slabs/drifts of recent snowfall. There were a lot of tracks from previous days nearby, but trigger in unknown. The other slide was 1-2' deep and 300-500' wide, soft slab of recent snow. Photo: GNFAC

Jan 2, 2025 We dug a pit between Scotch Bonnet and Sheep Mtn. on a sw facing slope at 9,800'. HS was 135cm (4feet). We had ECTP12 and ECTP26, both on a layer at similar height as the surface hoar has been found (1.5-2 feet above the ground). The weak layer was mostly 2-3mm facets w/ small cups and some signs of surface hoar on top of a melt-freeze crust. Photo: GNFAC

Rode out to Wolverine Pass on New Years Eve.  Daisy pass is a little spicy for novices still. On approach to  wolverine pass/YNP boundary we found HS 160cm on NE facing slope at 9200'.  Found 3-4mm SH in tact at 110 cm deep. Found 1-2mm FC at 60cm deep. Ectn27 at storm interface layer 60 cm deep. No results on SH layer, but many collapses during the day assumed to be on this layer.  Large D2-3 deep Slab avalanche seen on NW facing slope of Sunset Peak. Picture attached. Generally stable condions, but big avalanches on N,NE,NW facing slopes are a real concern for sure. 

We were ski touring on the SW side of Mt. Henderson today, and noticed a large (natural?) avalanche on the NE aspect of Henderson.  First observed at around 1:15pm.  It appeared to be very fresh, possibly from a remote trigger this morning.  

2 photos attached.   A NE aspect, around 10,000'.

It looked to be 4-6' deep and about 500' wide.  And it failed on snow at/ near the ground.

Photo: B Fredlund 

We were ski touring on the SW side of Mt. Henderson today, and noticed a large (natural?) avalanche on the NE aspect of Henderson.  First observed at around 1:15pm.  It appeared to be very fresh, possibly from a remote trigger this morning.  

2 photos attached.   A NE aspect, around 10,000'.

It looked to be 4-6' deep and about 500' wide.  And it failed on snow at/ near the ground.

Photo: B Fredlund

Scotch Bonnet Depth to Weak Layer 28 Dec 2024

A group on the "Rip Curl" area of Woody Ridge south of Cooke City report ECTP1 test results failing on buried weak layers. Photo: B. Henry

We ski toured in Sheep Creek today, north of Cooke City.  Of note, a thin (4mm) rime crust was forming due to the high humidity/ quasi rain.  Remarkably the rime crust skied very well.  Photo: B. Fredlund

We experienced several collapses and had propagation in multiple ECTs performed.  HS varies between 85-105cm. Photo from 9940

Photo: BMG

Photo: BMG

I saw a wide slab avalanche up on west Woody Ridge from town. It happened late on Wednesday or overnight during or after the strong winds and snowfall. Photo: GNFAC

Wind slab avalanche near Lulu Pass. Photo: GNFAC

Large persistant slab avalanche on Henderson. Photo: GNFAC

Persistant slab avalanche on Fisher that broke near the ground. Photo: GNFAC

D2 avalanche on east facing Mount Fox that appears to be on the SH layer, triggered by a cornice drop.

Photo: B Zavora  

NE facing, 10,000' Sheep Creek.

Photo: B Fredlund

 NE- N facing, 10,000' Mt. Henderson

Photo: B Fredlund 

NE- N facing, 10,000' Mt. Henderson

Photo: B Fredlund

NE- N facing, 10,000' Mt. Henderson

Photo: B Fredlund

E facing, 10,000 Mt. Henderson

Photo: B Fredlund

E facing, 10,200' Scotch Bonnet Mtn.

Photo: B Fredlund

NE facing, 9700', Miller Ridge

Photo: B Fredlund

 E facing, 9900', Bull of the Woods Pass 

Photo: B Fredlund

Natural avalanche, NE facing, 10,000, Miller Ridge

Photo: B Fredlund 

Lots of wind slabs south of Cooke today. Strong wind all day and lots of blowing snow. Photo: N Mattes

Plumes of drifting snow in the Bridger Range as strong winds blasted the mountains. Photo: GNFAC

The clouds broke briefly around noon on Tuesday in Cooke City. Two sections of the face on the Fin slid, one from the top, and one lower and to the right. Photo: N. Mattes