The dams have been damaging the ecosystem in the area. www.latimes.com/…/klamath-river-restoration Probably not a big deal overall, but that area is big on environmentalism.
Salmon like to live in the ocean and lay their eggs in freshwater, so they make the journey upstream. Plus, there’s all the other animals that try to catch salmon on their way up the river.
Also the dams were built without consent of any of the Native American tribes in the area, so that was kind of a big deal.