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Location:
River mile 34.5
on the Green River, near Auburn, upstream from the mouth of Big
Soos Creek (RM 33.7) and the Soos Creek Hatchery.
History:
In 1999, the
National Marine Fisheries Service (NMFS) listed Puget Sound chinook
as threatened under the Endangered Species Act (ESA). Green River
chinook stocks represent one of the largest populations of chinook
within the Puget Sound Evolutionary Significant Unit (ESU). To
assess stock performance, WDFW began a long-term project in 2000
to quantify freshwater production of wild juvenile salmon from the
Green River. Traps were operated on the Green River and Big Soos
Creek (RM 1.5) in 2000. The Big Soos Creek trap measured the production
of naturally-spawned hatchery chinook. As of 2001, only the Green
River trap has been operated. This project is also collecting baseline
fish production and migration timing data prior to construction/implementation
of the Howard Hansen Dam Additional Water Storage Project to increase
water supply to the City of Tacoma. The project will include a
variety of operational and mitigation elements that could effect
wild salmon production in the Green River basin.
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Methods:
A screw
trap is operated from early-February through mid-July in the
mainstem Green River. Sub-samples of various salmonids are
measured for fork length.
Available
Publications & Data:
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