CHINOOK SALMON
Oncorhynchus tshawytscha

---

SNAKE RIVER SPRING/
SUMMER-RUN ESU
LISTED THREATENED
April 1992

---

ESU* STATUS AND DESCRIPTION:  Listed as a threatened species on April 22, 1992 (see correction on June 3, 1992).  The ESU includes all natural populations of spring/summer-run chinook salmon in the mainstem Snake River and any of the following subbasins: Tucannon River, Grande Ronde River, Imnaha River, and Salmon River.

* An Evolutionarily Significant Unit or "ESU" is a distinctive group of Pacific salmon, steelhead, or sea-run cutthroat trout.

CRITICAL HABITAT:
Current Status - Designated on December 28, 1993; revised October 25, 1999.
Description - Critical habitat is designated to include river reaches presently or historically accessible (except reaches above impassable natural falls, and Dworshak and Hells Canyon Dams) to Snake River spring/summer chinook salmon in the Columbia River from a straight line connecting the west end of the Clatsop jetty (south jetty, Oregon side) and the west end of the Peacock jetty (north jetty, Washington side) and including all Columbia River estuarine areas and river reaches proceeding upstream to the confluence of the Columbia and Snake Rivers; all Snake River reaches from the confluence of the Columbia River upstream to Hells Canyon Dam.  Major river basins containing spawning and rearing habitat for this ESU comprise approximately 22,390 square miles in Idaho, Oregon and Washington.  The following counties lie partially or wholly within these basins: Idaho - Adams, Blaine, Custer, Idaho, Lemhi, Lewis, Nez Perce, and Valley; Oregon - Baker, Umatilla, Union, and Wallowa; Washington - Adams, Asotin, Columbia, Franklin, Garfield, Walla Walla, and Whitman.
        More detailed critical habitat information (i.e., specific watersheds, migration barriers, habitat features, and special management considerations) for this ESU can be found in the December 28, 1993 and October 25, 1999 Federal Register notices.

PROTECTIVE REGULATIONS:  On April 22, 1992, NMFS published a final rule specifying that the Endangered Species Act's Section 9 take prohibitions relating to endangered species also apply to this ESU.

ESU MAPS AND DATA:

• View Detailed Snake River Spring/Summer-run Chinook ESU Map (Adobe Acrobat PDF format)
• View Range Map for all Chinook ESUs
• Download Chinook salmon ESU data in Arc/Info export and shape file format
• Download E-sized plot files of West Coast chinook salmon listings in RTL file format for large format plotters

NOAA Technical Memorandum NMFS-NWFSC-35, February 1998
Status Review of Chinook Salmon from Washington, Idaho, Oregon, and California

FEDERAL REGISTER NOTICES:
View Federal Register Notices for Chinook Salmon

You will need Adobe Acrobat Reader in order to view and print files in PDF format. This program is available for free from the Adobe web site by clicking this icon: