Island Park

Many collapses in IP

Centennials - Idaho
Island Park
Code
Latitude
44.51680
Longitude
-111.63000
Notes

From FB:

We were in the centennials on 4FEB24 and felt whumping collapses on flat snow at 7500’ in the upper finger tributaries of Myers creek. 4 of us snowbiking, and some were using Voyager Pros and phone apps carefully watching slope angle and extremely wary of anything that typically we’d ride on in more stable times. I pulled up to wait for the other three in a relatively flat spot, when the next snowbike pulled up next to me I felt a drop of 2-4 inches and could hear it over the other riders engine. After he shut off I let him know. When the next ride pulled up to us it happened again I we all felt it! Th crust layer there was great for traction and seems to be about 6-10” thick over our weak faceted base layer of 2-3’. I haven’t experienced that in the past 9 seasons on the bike.
Number of slides
0
Number caught
0
Number buried
0
Snow Observation Source
Many collapses in IP
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year
23-24

Many collapses in IP

Date
Activity
Snowmobiling

From FB:

We were in the centennials on 4FEB24 and felt whumping collapses on flat snow at 7500’ in the upper finger tributaries of Myers creek. 4 of us snowbiking, and some were using Voyager Pros and phone apps carefully watching slope angle and extremely wary of anything that typically we’d ride on in more stable times. I pulled up to wait for the other three in a relatively flat spot, when the next snowbike pulled up next to me I felt a drop of 2-4 inches and could hear it over the other riders engine. After he shut off I let him know. When the next ride pulled up to us it happened again I we all felt it! Th crust layer there was great for traction and seems to be about 6-10” thick over our weak faceted base layer of 2-3’. I haven’t experienced that in the past 9 seasons on the bike.
Region
Island Park
Location (from list)
Centennials - Idaho
Observer Name
Aaron Vaughn

Island Park Observations

Date
Activity
Snowmobiling

From email: "Temp 27. 4'' new snow, Rate S1, Sky OVC. NE aspect, SE winds, L  observed localized drifting. Elevation 7790’. conducted several CT tests scored CTM and CTH (SC)  ECTP 21, NE of Two Top on a layer of SH 35cm from surface. New snow on a melt freeze crust very reactive CTE 15cm from surface. Possible new layer of concern as new snow accumulates. No recent avalanches observed."

Region
Island Park

Collapsing, Island Park

Island Park
Code
Latitude
44.46890
Longitude
-111.14700
Notes

No avalanches observed. A foot of new snow in 24hrs, 3-4 inches throughout the day. Strong wind gusts in the morning into early afternoon, drifting in open areas and higher elevations. Experienced multiple whoomphing in an open flat area.

Number of slides
0
Number caught
0
Number buried
0
Problem Type
Persistent Weak Layer
Snow Observation Source
New Snow and old snow collapsing
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year
23-24

New Snow and old snow collapsing

Date
Activity
Snowmobiling

No avalanches observed. A foot of new snow in 24hrs, 3-4 inches throughout the day. Strong wind gusts in the morning into early afternoon, drifting in open areas and higher elevations. Experienced multiple whoomphing in an open flat area.

Region
Island Park

Snow Profile

Date
Activity
Snowmobiling

120 cm HS, OVC, E aspect, 6" new snow, -4c air temp, 14 deg. incline, blowing snow: none. ECTP 22 at 101 cm

Region
Island Park
Location (from list)
Bell Lake
Observer Name
KC Hollingsworth Ride Rasmussen Style

Partial burial in Island Park

Sawtelle Peak
Island Park
Code
AMu
Latitude
44.56110
Longitude
-111.44300
Notes

From email on 2/2/24:  "We received a call of a missing snowmobile in the Keg Springs area of Island Park at 1642.  The missing snowmobiler arrived at 1800 hours at the rental property his party is staying at and said he had self-extricated from an avalanche."

 

Number of slides
1
Number caught
0
Number buried
0
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
Snow Observation Source
Partial burial in Keg Springs
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
23-24

Partial burial in Keg Springs

Date
Activity
Snowmobiling

From email on 2/2/24:  "We received a call of a missing snowmobile in the Keg Springs area of Island Park at 1642.  The missing snowmobiler arrived at 1800 hours at the rental property his party is staying at and said he had self-extricated from an avalanche."

 

Region
Island Park
Location (from list)
Sawtelle Peak
Observer Name
Fremont County

Low snow near sawtelle and Bootjack

Date
Activity
Snowmobiling

North of sawtelle peak between sawtelle and Bootjack. General observations of surprisingly low snowpack. Traveled from red rock parking lot to flats to Bootjack then south toward sawtelle then east to the flats and back north to red rock parking. The northern area had on average 6-10 inches, the southern area had 12-15 inches. Elevations were between 6300 and 7200 feet. Aspects were mostly NW to N to NE to E.

Region
Island Park
Location (from list)
Sawtelle Peak
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