Some of our regular walks take us over the Rt 376 bridge downstream of the Red Oaks Mill dam and I try to take a picture whenever we cross.
For reference, two years ago in December 2016:
January 2018:
April 2018:
October 2018:
November 2018:
December 2018:
The dam breast seem from the north (left in above pictures) in December 2018:
Searching for the obvious keywords will produce far more pictures than the subject may deserve.
Getting hydropower from the rubble would require considerable capital investment …
The Smell of Molten Projects in the Morning 
Power Station Museum
https://www.discoveringfinland.com/destination/power-station-museum/
We took a walking tour of Troy NY some years ago, which showed how all the industry clustered in the narrow valleys to tap the high-density power on its way to the Hudson River.
Instantly after steam power became practical, all the factories moved from the valleys to the flatlands (a.k.a. flood plains) along the river banks: nobody wanted a factory in a valley!