Spring Chinook in the Willamette and Sandy Rivers with 1996-2004 summaries; Progress Report 2005

Identification Information

Citation

Originator: Schroeder, R.K., K. R. Kenaston and R.B. Lindsay

Publish Date: 2005

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Cedric Cooney

Job Position: Natural Resources Data and Systems Manager

Telephone: 503-947-6094

E-Mail Address: cedric.x.cooney@odfw.oregon.gov

Description

Abstract: The Willamette and Sandy rivers support intense recreational fisheries for spring Chinook salmon (Oncorhynchus tshawytscha). Fisheries in these basins rely primarily on annual hatchery releases of 5-8 million juveniles. Hatchery programs exist in the McKenzie, Middle Fork Willamette, North and South Santiam, Clackamas, and Sandy rivers mainly as mitigation for dams that blocked natural production areas. Some natural spawning occurs in most of the major basins and a few smaller tributaries upstream of Willamette Falls. The Oregon Fish and Wildlife Commission adopted the Native Fish Conservation Policy (ODFW 2003a) and the Hatchery Management Policy (ODFW 2003b) in part to reduce adverse impacts of hatchery programs on wild native stocks. The Native Fish Conservation Policy recognizes that naturally produced native fish are the foundation for long-term sustainability of native species and hatchery programs, and the fisheries they support. In the past, hatchery programs and fish passage issues were the focus of spring Chinook salmon management in the Willamette and Sandy basins. Limited information was collected on the genetic structure among basin populations, on abundance and distribution of natural spawning, on rearing and migrating of juvenile salmon, or on strategies for reducing risks that large hatchery programs pose for wild salmon populations. This study is being implemented to gather this information. We conducted work in the main-stem Willamette River at Willamette Falls, and in the Middle Fork Willamette, McKenzie, North Santiam, South Santiam, Molalla, Clackamas, and Sandy rivers in 2004-2005. Task headings below cross reference the study plan outlined in APPENDIX A. This report covers tasks that were worked on in late 2004 through early fall 2005, and summarizes data from 1996-2004.

Purpose:

Time Period of Content:

Geographic Extent: Willamette, McKenzie, Santiam, Clackamas, Molalla and Sandy Rivers

Status: Final

Use Constraints:

Format: PDF File

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Data Information

No data information was supplied.

Entity and Attribute Information

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Is a physical copy maintained for reference at Headquarters? Yes