Observation: Broads Fork

Observation Date
3/7/2022
Observer Name
Zach W
Region
Salt Lake » Big Cottonwood Canyon » Broads Fork
Location Name or Route
Broads Fork
Comments
Headed up Broads Fork this morning to ski Bonkers. It seemed like below 6500 ft-ish, the recent storm snow fell on dry ground. On the way back out, we took our skis off around 6800 ft.
Breaking trail from the bridge, we felt good about stability. No big collapses or cracking. The new snow had not slabbed up - all fluff. This was the case independent of aspect or elevation, at least in Broads Fork (except in two places - see below). Winds in the drainage were nonexistent or just a breeze. No signs of substantial wind transport until about 200 ft below the saddle between Bonkers and Stairs Gulch. In our drainage, the sun was obscured by clouds for most of the time - maybe came out for a total of 20 minutes between 9 and 11 AM.
Ascending Bonkers, we observed very long-running, natural sluffs as the only sign of instability. Many had streamed over the slabs that form the eastern border of the run (pic 1 - NE aspect, sluffs running probably 500 ft. Not visible, but there were multiple, probably 8+), and a substantial sluff had funneled out of the small ramp/tube on the lookers right of the run (no pic).
At approximately 9500 ft, on a NNE aspect, I dug a quick hand pit to check out the snow structure (pic 2). I found approximately 30 cm of very light storm snow on top of approx. 40 cm of a 1f/4f slab. That sat atop a crust, then facets. I could form a snowball with the facets. Sorry for the middling info and picture :(
As we approached the saddle to ski back down, the snow was subtly more slabby in two places: on top of the line of rocks that almost poke up in the middle of the run and nearing the top (about 9800 ft+). Near the top, we observed what looked like increased wind loading/affect. It was more slabby than the light density fluff we had skinned through, but it still didn't concern us because (1) we knew winds hadn't been very high overnight and (2) the areas did not feel overly compacted or slabby. In our assessment, it was more slabby, but not too slabby. Fortunately nothing moved on the up or down.
Looking into stairs gulch, I observed additional natural activity. There were sluffs as had been observed in Broads and a natural avalanche off one of the slabs (pic 3). It was at least a couple hundred feet wide. I judge the location of the natural to be approx 40.60502, -111.73217, for what it's worth.
Today's Observed Danger Rating
None
Tomorrows Estimated Danger Rating
None
Coordinates