Dams, Logging, Mining, and Agriculture
Dams block access to the cold-water habitats vital for the survival of salmon and steelhead. Removing them restores connectivity across diverse environments, which in turn fosters life history diversity—the more varied the habitats fish can use, the more diverse and resilient they become. Yet even undammed, relatively intact watersheds are threatened by shortsighted land use practices, such as logging and mining, that are known to degrade habitat quality and reduce the spatial distribution, life history complexity, and productivity of wild salmon and steelhead.