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East Fork Toklat photo pair
Photo Credits: Rob Burrows (2010), Rob Burrows (2014)
Ecoregion: Alaska Range Mountains
Change Type: Glacial thinning and retreat
Glacial thinning and retreat
This photo pair shows a view of the largest glacier at the head of the East Fork Toklat River watershed. In 2014 this glacier was visited by citizen science expeditions to map the terminus and ice surface elevations of the glacier with a high precision global positioning system (GPS). The changes to the glacier in this relatively short time period (4 years) are somewhat subtle. While it may be hard to pick out in the photo pair, the data show that the glacier’s terminus retreated ~50 meters between 2010 and 2014. It is clear that 2014 saw more lasting snow from the previous winter in the high elevations than did in 2010. The Glaciology Citizen Science expedition is a partnership between the NPS and Alaska Geographic through the Murie Science and Learning Center. To learn more about the expedition go to