Yup, mostly tourism/maintenance of flows, downstream concerns, etc. It's drawn up in a treaty between the US and Canada, I think the International Joint Commission[1] is in charge/involved. The International Control Dam is the key structure[2].
[1] http://www.ijc.org/en_/inbc [2] https://en.wikipedia.org/wiki/International_Control_Dam
EDIT: Also, there's the St. Lawrence Power Project[1] at the Moses-Saunders Power Dam[2]. A similar cooperation with very different design. New York has the most hydropower in the eastern half of the united states by quite a lot.
[1] https://www.google.com/maps/place/Moses-Saunders+Power+Dam,+...