[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.

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