CRTCP - Monitoring of Downstream Fish Passage at Cougar Dam in the South Fork McKenzie River, Oregon 1998-00

Identification Information

Citation

Originator: Greg A. Taylor

Publish Date: February 8, 2000

Online Link: http://nrimp.dfw.state.or.us/crl/Reports/CRTCP/Cougartrap98_00fin_rpt.pdf

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Mark Wade

Job Position: Project Leader

Telephone: (541)757-4263 x226

E-Mail Address: mark.wade@oregonstate.edu

Description

Abstract: In 1993, Oregon Department of Fish and Wildlife (ODFW) began placing adult chinook salmon that were excess to hatchery operations at McKenzie and Willamette Hatchery above Cougar Dam in an attempt to restore some of the biological contributions salmon made to the ecology of the South Fork McKenzie River prior to Cougar Dam construction (Table 1). Contributions included increased nutrient input to the ecosystem and an additional food source for predators, including bull trout. In addition, the progeny of these adult salmon provided a landlocked chinook fishery in the reservoir and ODFW was able to discontinue annual releases of juvenile salmon reared in ODFW hatcheries (1996). ODFW assumed most of the salmon attempting to leave the reservoir would be killed by various means upon passage through the turbines or regulating outlet. Between 1994-97, ODFW field observations provided circumstantial evidence that some juvenile chinook were surviving passage through the dam. In 1998, we began monitoring juvenile chinook migration out of the reservoir to determine the number, size, age, and mortality rate of fish passing through the turbines and regulating outlet of Cougar Dam.

Purpose:

Time Period of Content: 1998-2000

Geographic Extent: South Fork McKenzie River

Status: Final

Use Constraints:

Format: PDF File

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Is a physical copy maintained for reference at Headquarters? No