Ecosystems

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Agassiz Glacier in 1913 and 2007
March 12, 2021

Agassiz Glacier in 1913 and 2007

Agassiz Glacier: 8/5/1913 WC Alden, USGS Photographic Library - 8/24/2007, D Fagre, USGS 

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Repeat photo of Harrison Glacier (1913, 2009)
March 11, 2021

Repeat photo of Harrison Glacier (1913, 2009)

Repeat photo of Harrison Glacier. 8/20/1913 by WC Alden, USGS Photographic Library, 7/30/2009 by Ralph Thornton, USGS.

Shepard Glacier
March 11, 2021

Shepard Glacier

Karen Holzer and Lisa McKeon rephotograph Shepard Glacier from the slope of Pyramid Peak, Glacier National Park. 1998 USGS photo.

March 11, 2021

Managing Post-Fire, Climate-Induced Vegetation Transitions

Warmer, drier and longer fire seasons in the Northwest have led to larger and more frequent wildfires. These changes in fire activity, combined with warmer and drier post-fire conditions, have in turn led to growing concern that in some areas of the Northwest, particularly in forests and shrublands east of the Cascade Range, existing plant communities may face difficulty

Chaney Glacier 1911 and 2005
March 11, 2021

Chaney Glacier 1911 and 2005

Chaney Glacier:  1911, MR Campbell, USGS Photographic Library – 8/19/2005 Karen Milone, USGS 

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Boulder Ice Cave Glacier 1932 and 1988
March 11, 2021

Boulder Ice Cave Glacier 1932 and 1988

Boulder Glacier Ice Cave:  1932, TJ Hileman, GNP Archives – 1988, J DeSanto, U of M Library 

This photo pair inspired the USGS to document glacier and landscape change using oblique photography.

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Repeat photo of Grinnell Glacier (1910, 2016)
March 10, 2021

Repeat photo of Grinnell Glacier (1910, 2016)

Grinnell Glacier in 1910 (Elrod photo, U of M Collection) and 2016 (McKeon photo, USGS).  Retreat resulted in glacier fragmentation, so the 2016 scene shows both Grinnell Glacier, hugging the base of the cliff, and The Salamander Glacier, perched above, along the right edge of the photograph.

Shepard Glacier in 1913 and 2005
March 10, 2021

Shepard Glacier in 1913 and 2005

Shepard Glacier:  9/6/1913, WC Alden, USGS Photo Library – 8/21/2005, B. Reardon, USGS

Aerial analysis showed that by 1998 Shepard Glacier fell below the area cutoff of 0.1 km2, too small to be considered a

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Sperry Glacier in about 1930 and 2008
March 10, 2021

Sperry Glacier in about 1930 and 2008

Sperry Glacier: circa 1930, MJ Elrod, U of M Library – 9/17/2008, L McKeon, USGS 

Repeating this photo from the same photo point was impossible since the historic photo was shot from the elevated perspective of the glacier’s surface.

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Grinnell Glacier from 1938 and 2019
March 9, 2021

Grinnell Glacier from 1938 and 2019

Grinnell and The Salamander Glaciers from the summit of Mt. Gould: 1938, TJ Hileman, GNP Archives – 9/4/2019, L McKeon, USGS

Upper Grinnell Lake has formed as the glacier has retreated.  The change in height of Grinnell Glacier along the cliff face hints at  volume loss during this timespan. 

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Swiftcurrent Glacier in 1910 and 2016
March 9, 2021

Swiftcurrent Glacier in 1910 and 2016

Swiftcurrent Glacier: circa 1910, M. Elod, GNP Archives - 9/27/2016, L McKeon, USGS

During the timespan between these photos, it is evident that Swiftcurrent Glacier has retreated and wildfire has consumed a patch of trees at the base of Swiftcurrent Mountain, the broad, beige slope in the background. 

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Logan and Red Eagle Glaciers in 1914 and 2009
March 9, 2021

Logan and Red Eagle Glaciers in 1914 and 2009

Logan and Red Eagle Glaciers: Aug. 1914, EC Stebinger, USGS Photo Library – 9/2/2009, L McKeon, USGS

These glaciers were once a continuous glacier, but became separate glaciers as retreat progressed.

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