Enduring presence of beaver dams in MI, 150 years
Someone with time on their hands could probably match up the 150-year old map in this link with a similar view of today on Google Earth.
- Leslie Sokolow
[EDIT: actually it was quite easy to find the locale on Google Earth. Enjoy: https://www.google.com/maps/place/Teal+Lake,+Negaunee,+MIfirstname.lastname@example.org,-87.7142807,8094m/data=!3m1!1e3!4m2!3m1!1s0x4d51c23f8bb2d9f9:0x8d98ec404f8aa8ce]