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.
Information
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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