Harrison Glacier is a glacier located in the US state of Montana in Glacier National Park.[3] Situated on a southeast‐facing ridge immediately south of Mount Jackson, it is the largest remaining glacier in Glacier National Park, estimated in 2005 to have an area of 466 acres (1.89 km2).[2][4] Though many experts have stated that all the glaciers in Glacier National Park may disappear by the year 2030,[4] Harrison Glacier lost only 9 percent of its surface area in the 40-year period between 1966 and 2005 and will likely still exist well beyond 2030.[5] Compared to many of the vanishing glaciers in Glacier National Park, Harrison Glacier's accumulation zone is at a much higher altitude (approximately 9,000 feet (2,700 m)), which has allowed it to maintain some equilibrium in its glacier mass balance.[5] Comparisons of images of the glacier taken in 1913 with images from 2009 indicate that the glacier has experienced thinning and retreat.[6]
^"Harrison Glacier 1913–2009". Repeat Photography Project. United States Geological Survey. Archived from the original on February 19, 2013. Retrieved September 22, 2012.
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