Status Review for Mid-Columbia River Summer Chinook Salmon

We have concluded that mid-Columbia River summer chinook salmon as petitioned are not a species or Evolutionarily Significant Unit (ESU) as defined by the U.S. Endangered Species Act (ESA). Rather, they are part of a larger ESU that includes all late-run (summer and fall) , ocean-type chinook salmon from the mainstem Columbia River and its tributaries (excluding the Snake River) between Chief Joseph and McNary Dams. We have also concluded that at the present time this larger ESU is not likely to become endangered in the foreseeable future and does not warrant listing as a threatened or endangered species. 1995 NMFS (National Marine Fisheries Service) NWFSC (Northwest Fisheries Science Center) Library Public Domain 1861