By Mel, MN (Mehollop) on Thursday, March 7, 2013 - 04:48 pm:
Speaking as a grad of said Forestry School, I can tell you definitively that it is an Eastern Cottonwood (Populus deltoides). Cottonwoods are very fast growing trees, and despite the size of this one, it is likely not what could be considered "old" for a tree. Without any actual reference, I would feel confident in guessing the tree was planted on campus less than 100 years ago. Tech is somewhat out of the natural range for Cottonwood (they're native to about the 45th parallel and south), and not the sturdiest of trees. The big hole in its side was probably a secondary branch at one point that broke off due to wind, ice or snow loading. This provided a point for moisture to enter the tree and cause rot. If I recall correctly, there's a big slug of concrete in the center of the tree as well.
This photo from the MTU Archives may show the tree, but I can't quite recall the placement relative to the Library & Fisher Hall - the parking/streets are throwing me off: http://digarch.lib.mtu.edu/showbib.aspx?bib_id=600328#
By Karen Benton (Nerakthenice178) on Thursday, March 7, 2013 - 05:00 pm:
Great pictures, Emma! Thanks for sharing your fun with us!