Smolt ESU Passage Predictions based on PIT Tag Detections
for Upper Columbia and Snake River ESU Stocks

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Current Predictions 25 December 2007

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Select Forecast Category

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ESUs (Evolutionarily Significant Unit) are the distinct populations listed for protection under the Endangered Species Act (ESA). See ESA Listing Pages, Protected Resources, NMFS, NOAA, for detailed information on ESA listings and ESU status and descriptions of specific stocks.

• Wild Snake River Spring/Summer Chinook ESU consists of 39 local spawning populations (subpopulations) of the following: Tucannon River Basin, Snake River Basin, Salmon River Basin, Lemhi, Pahsimeroi, Grande Ronde, and Imnaha River Basin, and includes all locations above river kilometer 522.000.
• Snake River Wild Fall Chinook ESU consists of the production from spawning populations of fall chinook in the Snake, Tucannon, Clearwater, Salmon, Imnaha and Grande Ronde Rivers.
• Snake River Sockeye ESU currently consists of Redfish Lake stock sockeye in the captive broodstock program at Eagle and Beef Creek hatcheries, and the hatchery fish released from this program into Redfish Lake, Pettit Lake, Pettit Creek, and Redfish Lake Creek; wild residual sockeye in Redfish Lake and their out-migrating progeny; any naturally-spawned progeny of broodstock adults released into Redfish Lake in 1993-94; and any adults returning to Redfish or Pettit Lake.
• Snake River Wild Steelhead ESU includes all naturally spawned populations of Summer run steelhead (and their progeny) in the Snake River Basin.
• Upper Columbia River Steelhead ESU includes all naturally spawned populations of steelhead (and their progeny) upstream from the Yakima River, Washington (above river kilometer 539), to the United States-Canada border and the Wells Hatchery stock of Summer run steelhead.

Chinook Fall, Upper Columbia River stock is composed of PIT tagged chinook where the run is designated as Unknown or Fall, the rearing type is designated as Unknown or Wild, the release site is on the Columbia River above the Snake Confluence, and the McNary detection date occurs after June 20^th of the same year the fish was released.