“Sperry glacier in 1900 had a surface area of 840 acres. By 1938 the area had shrunk to 390 acres, and in 1946 to about 330 acres. Even more significant is the lowering of the glacier’s surface. In 1938 Sperry glacier had a thickness of 108 feet at the site of the 1946 ice margin. At this same place in 1913 the thickness was nearly 500 feet, and the average thickness of the glacier over the area from which it has since disappeared at least 300 feet. The average thickness of Grinnell glacier in 1937 at the site of the 1946 ice front was seventy-three feet. The surface of the entire glacier was lowered fifty-six feet during that 9-year period. This means that each year the glacier was reduced in volume by an amount ‘of ice equivalent to a cube 450 feet high. Thus the volume of Grinnell glacier was reduced by about one-third from September, 1937, to September, 1946.

One Is Almost Gone.

“Several other glaciers have exhibited more — phenomenal shrinkage than Sperry or Grinnell. The topographic map of Glacier National park. prepared in 1900-1902, shows several comparatively large glaciers such as Agassiz, Blackfoot and Harrison. Their shrinkage has been so pronounced that today Agassiz has virtually disappeared and the other two are pitifully small remnants”

05 Sep 1952, 34 – The Kansas City Times at Newspapers.com

Satellite imagery shows that the Grinnell Glacier has expanded over the past thirty years.

But the satellite deniers at Yale University say the glacier isn’t growing.

Fact check: No, the glaciers are not growing in Glacier National Park » Yale Climate Connections

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  1. conrad ziefle says:

    I think that they are giving the instantaneous rate as zero, because as of that instant it was summer.

  2. Jb says:

    went up boulder peak trail this year. saw the Agassiz glacier all the way up.
    hiked Comeau pass trail this year and saw the Sperry glacier.
    walked behind Reynolds mtn (south side) this Saturday and saw both Blackfoot and Jackson glaciers as well as Sperry, and also climbed mt. Oberlin and saw vulture and 2 oceans glaciers to the north.

  3. Bob G says:

    in 1980 I hiked with my cousin from many glacier hotel to grinnell glacier. it was a long hike and I recall when we reached the glacier it was not very big was not impressive and that was in 1980. in the photos above I really can’t tell a difference but we do know this according to the park literature the glacier park glaciers are only 3,000 years old so we know it was warmer 4,000 years ago.

  4. Ann Inquirer says:

    The 2020 photo shows a bit ice & snow. However, there is not a date on the photo. So if you are comparing July 4, 1991 to March 15, 2020, the difference is understandable. If there was some documentation that they were taken on the same day in both years, then you have clear point.

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