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Flathead

South Rockies

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Cmon Corbin!

Published: Mar 25th, 2026
Today the South Rockies team took a chance on riding from Corbin staging and were pleasantly surprised at the quality of access! The recent snow made a big difference for the trail, there was a thin fresh coating of wet snow right from the parking lot! The old grooming held up to the rain reasonably well, only a few patches of thin coverage over dirt. As we climbed towards Rain gauge the snow quality improved steadily and we found 20 cm of dry new snow above 1800 m. Below the new snow there is a supportive crust which made for some slippery riding while getting into the throttle or descending slopes. We did not venture above treeline today. Strong to extreme westerly winds in the alpine made for uncomfortable and potentially dangerous conditions at higher elevations. We observed intense snow transport at ridge tops this morning. Exposed areas are scoured down to ice. Significant snow drifting and deposition is occurring on a variety of aspects in the treeline and alpine. We dug a profile in a sheltered area at 2100 m. Snowpack depth is 220 cm at our profile location. The upper snowpack contains many layers of crust and a variety of snow grain types but is not producing any concerning failures below the recent storm snow. We had easy resistant planar failures of the storm snow/crust interface at CTE 6. No propagating results with ECT. We did not see any evidence of large natural avalanches during the recent rain event. Overall better quality riding than we anticipated. Springtime conditions are beginning to shape up nicely, but the snowpack still needs more time to settle before we would consider stepping out to larger features.

Rolling Hills Roopin'

Published: Mar 12th, 2026
Today the South Rockies team went for a braap in the Rolling Hills area. We intended on accessing from the Coal Creek trailhead however we were uncertain about driving higher up than the staging kiosk, and there was a lack of snow to ride right from valley bottom. We pivoted and accessed via the Morrissey upper staging, and signage was very clear on where to drive and park! There was about 5 minutes of low snow riding on the road before we hit good trail conditions the rest of the way! Our aim today was to assess surface snow conditions after last nights storm, and test the Persistent Slab problem in our snow pit again after some additional loading. Above 1500m there was 20-30 cm of new snow that had been redistributed by wind forming large cornices and drifts. We found the best riding in sheltered low angle lee slopes where the wind had stacked up a little extra snow! Windward aspects near ridgetops and open areas were largely stripped back to a firm crust. We were able to get storm slab results on small loaded test slopes with crown depths of 20-80 cm, and we observed a recent natural avalanche from a steep north facing lee slope at 2000m. This slope is a common performer near the Rolling Hills Cabin, see image. Below the recent snow there is a widespread 5-15cm crust on all aspects below 2000m. Our snowmobiles were not able to penetrate this crust. In our snow pit, we had moderate propagating results (ECTP 12), storm snow failing on crust/graupel down 25cm. We had no results (ECTX) on the Persistent Slab problem, however we were still able to identify preserved surface hoar buried 90 cm deep. In places where the crust is less supportive, human triggering of the Persistent Slab problem is still a concern. Overall a nice day out with some decent riding, and there is still plenty of fresh left in sheltered areas to enjoy some fun, supportive tree riding! We avoided steep wind loaded slopes, gave cornices a wide berth, and had a great day out in the hills!

McClatchie McTricky

Published: Mar 3rd, 2026
A fine sunny day for a toodle in the flathead region. We were able to drive to KM 46.5 on the McClatchie FSR, there is active logging in the area so make sure you have your radio and call your KM if you head up that way. We headed towards Next of Kin to investigate the sensitivity of the Persistent Slab problem that has been ongoing in this region. We found 30-65 cm of snow on the weak layer, and had multiple audible whumpfs while travelling on foot through mellow sheltered terrain between 1800-2000m. Rutschblock tests on North and south aspects produced easy repeatable results RB 1 and RB 2 whole block failures. The persistent weak layer in this area is 10 cm thick and consists of 15-20 mm surface hoar and facets over a supportive crust. This layer is not showing any signs of healing, and is widespread in the tree-line. While natural avalanche activity is tapering off in the flathead, human triggered avalanches are still likely. Below treeline is still very thin coverage, and warm temperatures have made the snowpack become isothermal. Alpine features have been largely affected by continued moderate winds. Loaded areas are suspect to have a wind slab problem, and wind stripped areas are a mix of ice, sastrugi, and rock. Unfortunately the reality is that where good ski quality exists, a reactive persistent slab problem is a dominating concern. This sent us home early with our skins still on, and with no travel in avalanche terrain today.

Sun, Slabs, Snacks, Shepp Creek

Published: Feb 10th, 2026
Today the field team returned again to the Lodgepole road! Our smoothest trip of the season so far in this area. The road was drivable to 39km where there is plowed in mounds of snow blocking further travel for the truck. It seems there is still active logging and industrial work going on so make sure you use your radio and park your vehicle out of turnaround zones. It was a fine day with high cloud and light SW winds. Temperatures rose to -1 at 2100m. We ski toured up a low angle south facing treed slope to the ridgeline, and dug on an East aspect to investigate the current persistent weak layer (PWL). On our way up we noticed whumphing on all aspects above 1900 m. Solar aspects above 1900 m hold 10 cm of snow over the PWL, and polar aspects hold up to 25 cm of snow over the PWL. Within the 10 cm on solar aspects a 3 cm sun crust exists and is supportive to skis. This crust does not exist on polar aspects. We had propagating failures on the PWL in our test pit, ECTP11 and PST 20/100 SF. The buried surface hoar that makes up the PWL is easily identifiable and up to 30 mm in size. Traveling on the ridgeline away from our profile location we had significant whumphing, shooting cracks extending 50 m from our skis, and remotely triggered a size 1 avalanche on a NE aspect. We skied down a SW aspect and experienced no other signs of avalanches. We observed no new natural avalanches. We will continue to be wary of shady aspects in the treeline and alpine as this PWL remains ripe for human triggering. Extra caution is warranted to avoid overhead hazard and connected terrain as remote triggering is still a possibility.
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