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Jack glacier

Jack glacier was a small glacier on the eastern side of Three Fingered Jack. Despite existing up into the 1980s with deposition of a prominent end moraine and being included in U.S.G.S. scientific publications, this glacier was never put on a U.S.G.S. map. It is now gone, disappearing sometime in the last 40 years. The glacier was at a very low elevation, extending to tree line; this means its shaded aspect with avalanche-supplied snow allowed the glacier to persist until the climate began to regionally warm in the 1980s.


Latitude: 44.483

Longitude: -121.839

Aspect: 45.0

Head (m asl) 1950s: 2290

Terminus (m asl) 1950s: 1850

Area (km^2) 1950s: 0.093

Head (m asl) 2020s: -

Terminus (m asl) 2020s: -

Area (km^2) 2020s: 0

Status: gone

Last observation: 2021

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