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October 23, 2011

Borealis Glacier separation and retreat

The Borealis Glacier in the North Cascades of Washington, descends the north side of Primus Peak. Unfortunately the peak is not in prime condition. The thinning glacier has separated into two ice masses, the lower section has also developed a new lake since 1995. The USGS map for the glacier indicates the upper and lower glacier connected by two ice tongues (top image). This connection has been severed by 1990 …