Snowpack at Gumboot and Cliff Lakes

Location Name:

Gumboot and Cliff Lakes

Region:

Mt Eddy

Date and time of observation:

Tue, 03/05/2019 - 3:00pm

Observation made by:

Professional Observer

96067 Mount Shasta , CA

United States

41° 12' 27.0792" N, 122° 30' 39.4128" W

California US

Observations near Gumboot and Cliff Lake:

Height of snow (HS): 380 cm (150 in).
Height of new snow (HN): 5 cm (2 in).
New moist snow sits atop widespread 12 cm (5 in) melt-freeze crust.
Except for melt-freeze crust, snow pack is right side up to 2/13/19 rain crust ↓ 155 cm (61 in).
Results of column tests (CT), extended column tests (ECT), deep tap tests (DT), and shovel shear tests (ST):
- CT12x2 RP ↓ 17 cm (7 in), failing on 4F hard decomposing fragments (DF).
- CT28 RP ↓ 70 cm (28 in), failing at slight density break.
- ECTN12 ↓ 17 cm (7 in), failure propagated about 50 cm.
- DTNx2, STH, focusing on old 2/13/19 rain crust.
- Similar results were found in Cliff Lake basin.
Signs of an old R4/D3 slab avalanche were seen at Cliff Lake. Cracked the lake ice. Most probably occurred last week 2/27/19 around the same time as the Left Peak avalanche at Castle Lake.