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Avalanche Specialists with the USGS/NPS Going to the Sun Road Program travelled up GTSR, staying on road grade from Logan Creek to The Loop (~4300 feet elev). Went down the same route.
Wet snow conditions throughout the tour. Boot penetration was 20-30 cm into mushy wet grains. Visibility was limited at times but we did not see any new avalanche activity and found mostly stable conditions. Most recent avalanche activity was wet loose, up to D2 most likely running on Tuesday (4/4) when it was warm and sunny. These were observed on multiple aspects and mostly above 5000 feet elevation.
Also noted glide cracks on Heavens Peak (photo) and in a couple paths above GTSR.
Variable weather with a mix of broken, overcast, and obscured skies. Winds ranged from calm to moderate in strength, blowing mostly from the south-southeast. There were occasional periods of moderate to heavy rain that would last about 30-45 minutes followed by mostly dry weather. Above freezing temperatures during the tour, but at about 1300 noticed temps began to drop. Garden Wall weather station dropped from 35 deg F at 1200 to 27 deg F at 1400.