2. Glacier National Park, MT
1) What time of year do you think these photos were taken? Is this the same for both photos? How can you tell?
Grinnell Glacier
Glacier National Park, MT
I think both photos are taken in the summer. This is because both men are not wearing thick coats which I think would be needed in winter.
1920
2008
Unknown photographer
Courtesy of NPS Historic
Photograph Collection
Harpers Ferry Center
Chris Miller photo
USGS
The 1920 photo shows National Park Service Director, Steven Mather, on Piatt Path near present day
Grinnell Glacier Overlook. Darren Pfeifle strikes a similar pose in the 2008 repeat photograph.

3. Glacier National Park, MT
Grinnell Glacier
Glacier National Park, MT
2) How much has the Glacier reduced in size in the time between the 2 photos?
The main Glacier has retreated back up the valley. With this view, this looks like a large retreat as you cannot see the terminus in the 1920 photo and it is clear in 2008.
1920
2008
Unknown photographer
Courtesy of NPS Historic
Photograph Collection
Harpers Ferry Center
Chris Miller photo
USGS
The 1920 photo shows National Park Service Director, Steven Mather, on Piatt Path near present day
Grinnell Glacier Overlook. Darren Pfeifle strikes a similar pose in the 2008 repeat photograph.

4. Grinnell Glacier Glacier National Park, MT 1920 2008
3) Are there any other changes to the Glacier?
The Glacier looks a lot shallower in the 2008 photo as the rock circled is a lot more exposed in 2008.
There is also a lot less snow further up the mountain such as in the crevasses beneath where the men are standing.
1920
2008
Unknown photographer
Courtesy of NPS Historic
Photograph Collection
Harpers Ferry Center
Chris Miller photo
USGS
The 1920 photo shows National Park Service Director, Steven Mather, on Piatt Path near present day
Grinnell Glacier Overlook. Darren Pfeifle strikes a similar pose in the 2008 repeat photograph.

5. Glacier National Park, MT
Grinnell Glacier
Glacier National Park, MT
4) What other information would you find useful to help you fully understand these photos?
It would be useful to know which month these were taken in to ensure these were not seasonal changes.
It would be also be good to have a scale on the photo or a map image along side this to allow a measurement of retreat to be taken.
1920
2008
Unknown photographer
Courtesy of NPS Historic
Photograph Collection
Harpers Ferry Center
Chris Miller photo
USGS
The 1920 photo shows National Park Service Director, Steven Mather, on Piatt Path near present day
Grinnell Glacier Overlook. Darren Pfeifle strikes a similar pose in the 2008 repeat photograph.

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OCR acknowledges the use of the following content: skills: ayzek/Shutterstock.com, focus: Roberto Piras/Shutterstock.com, Glacier National Park, MT , Unknown photographer Courtesy of NPS Historic Photograph Collection Harpers Ferry Center: Glacier National Park, MT , Chris Miller photoUSGS Repeat Photography: Project
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