Coho salmon
Coho salmon ("Oncorhynchus kisutch") populations have declined dramatically in the Klamath River watershed due to eutrophication, raised water temperatures and decreased stream flows induced by the construction of dams, especially in years of drought. In addition, the dams have blocked access for salmon spawning grounds on over 300 miles of Klamath River watershed. The Coho salmon in the Southern Oregon - Northern California Coast (SONCC) Evolutionarily Significant Unit (ESU) are federally listed as threatened and are also listed as threatened by the California Department of Fish and Game since 2002.