Field Report

Northern San Juan - CO

2025/04/12
Lat: 37.824, Lon: -107.922
Backcountry Area: Northern San Juan
Author: Chris Dickson
Organization: Forecaster, CAIC

Report Information

Observation Summary

Overnight temperatures barely dipped below freezing on Lizard Head Pass, and in most places across the region, it didn't freeze overnight. Luckily, clear skies and radiational cooling did create supportable surfaces early this morning. But with a superficial freeze, surfaces also became soft very quickly, with good soft conditions on east-facing slopes coming as early as 8:30am. I observed some old cornice fall debris on Blackface Mountain, but no recent cornice fall and not much recent Loose Wet activity. Notably, still haven't seen any new Wet Slab activity in the area... yet.

Area Description

Blackface Mountain, Lizard Head Pass.

Route Description

South and east facing terrain at all elevations.

Avalanches

Saw an avalanche

Wet Loose activity on Sunshine Mountain, Lizard Head Peak, and in the Wilson Range. Most of it appears several days old.

i
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Date # Elev Asp Type Trig SizeR SizeD Problem Type Location
04/09/2025
4 >TL E WL N R1 D1 Loose Wet
04/10/2025
1 >TL SE WL N R2 D1.5 Loose Wet

Snowpack

Cracking: None
Collapsing: Minor

Mostly supportable surfaces out there, except for in the trees, where I found either a thin eggshell crust from overnight or the snow was fully wet still and unfrozen. In open meadows, the surface crust was about 20cm thick and wet and unfrozen below that. Above treeline, the crust was thicker and more firm. I traveled adjacent to some cornices, which were large and saggy, but still cold and frozen solid.

Weather

A light breeze and strong solar input meant conditions warmed quickly on southeast-facing terrain. There were some high stratus clouds forming to the west, but it was full sun while I was out, until 9:30am.

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