Four dams were built along the Boardman River in Northwest Michigan to generate hydroelectric power for Traverse City.
But by 2004 they were no longer economically viable. A decision was made to remove three of the dams and renovate the last one in downtown Traverse City.
Now the removal of the dams has changed the nature of the river and allowed native fish to return.
Great Lakes Now
https://www.greatlakesnow.org/2020/10/damming-decisions/