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Collier Glacier

Collier is a large glacier on the northwest flank of North Sister. It is one of the most studied glaciers in Oregon, with direct observations of its mass balance occurring in the late 1980s to mid 1990s. 


Latitude: 44.165

Longitude: -121.785

Aspect: 345

Head (m asl) 1950s: 2800

Terminus (m asl) 1950s: 2220

Area (km^2) 1950s: 1.170

Head (m asl) 2020s: 2720

Terminus (m asl) 2020s: 2340

Area (km^2) 2020s: 0.490

Status: active

Last observation: 2021

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