George Bird Grinnell of Grinnell Glacier fame in Glacier National Park, wrote during a 1926 trip [1]:
"...the glacier is melting very fast and the amount of water coming from it is great. All these glaciers are receding rapidly and after a time will disappear."
That's interesting but it seems too early to be caused by anthropogenic climate change. The Little Ice Age extended into the 19th century, during which those glaciers presumably expanded. The end of that era would have resulted in the glaciers shrinking back.
"...the glacier is melting very fast and the amount of water coming from it is great. All these glaciers are receding rapidly and after a time will disappear."
[1] https://www.repository.law.indiana.edu/facpub/747/