Bridger Range

Avalanche in Hourglass chute above Wolverine. It looked to be triggered by an intentional cornice drop, was around 12 inches deep at the crown, 100' wide and ran 850' vertical feet. It looked around three days old.

Today, we toured up and out of the north boundary of Bridger Bowl: up the Ramp, into Wolverine Bowl and on top of Texas Meadows. We got eyes on a lot of terrain north of Bridger and were able to dig in six or more different locations, with up to 12 extended column tests. Generally, we found a similar snowpack here as we have seen in the rest of the Bridger range: a slab of varying depths but generally about a foot thick on top of 1-2 mm facets generally in the middle of the snowpack.

In our pits near the top of the ridge, we got unstable test results with propagation on top of the facets. But as we dropped elevation, we found that we were unable to replicate propagation, and only got ECTN scores. These pits at lower elvations looked very similar to what Ian and I found just north of this area on Thursday (Ob from the Throne). One notable pit finding was a very thin layer of surface hoar near the top of the Ramp, as noted in our snowpilot (attached). 

Pit propagation was our first sign of instability, and as we continued along ridge past Wolverine we came across a R2 D2 slide in the Hourglass chute above Wolverine. It looked to be triggered by an intentional cornice drop, was around 12 inches deep at the crown, 100' wide and ran 850' vertical feet. It looked around three days old. As we skied down into Wolverine from the Ramp, we noted two other avalanches that seemed like they broke during the loading event that occurred last Sunday/Monday (12/15-16). These slides looked similar to the natural avalanche noted on Saddle this Thursday (Saddle Peak avalanche observation). 

Throughout our tour, our snowpack layers looked very similar. Pit propagation up high and recent avalanche activity showed us that the odds of triggering an avalanche in steep, wind loaded terrain were higher than we were comfortable with riding today. At lower elevations, our findings indicated the odds of triggering an avalanche are becoming less likely.   

Dug a pit at 7600 ft on a NE facing slope. Full propagation on isolation of the column on the layer of concern about 16 inches down in this zone. Photo: Anonymous

Went out to have a look in the northern Bridgers today, hopeful that the moderate rating for the Bridgers today would lead to some fun lowish angle action. 
Dug a pit at 7600 ft on a NE facing slope. Full propagation on isolation of the column on the layer of concern about 16 inches down in this zone. Went a little higher up and got a big whumpf and that was all I needed to bail on even the lower slopes. 
 

Photo of a natural on Saddle Peak taken from the highway. Slide occured on 12/18 and was previously reported. Photo: GNFAC