Northwest Fisheries Science Center

Display All Information

Document Type: Journal Article
Center: NWFSC
Document ID: 7015
Title: Estimating the daily passage of juvenile salmonids at McNary Dam on the Columbia River
Author: Albert E. Giorgi, Carl W. Sims
Publication Year: 1987
Journal: North American Journal of Fisheries Management
Volume: 7
Issue: 2
Pages: 215-222

The U.S. National Marine Fisheries Service, under contract to the U.S. Army Corps of Engineers, monitored the seaward migration of juvenile salmonids through the Snake-Columbia River system from 1973 to 1983.  We developed a procedure for estimating the numbers of steelhead Salmo gairdneri and yearling chinook salmon Oncorhynchus tshawytscha smolts passing McNary Dam each day in 1982-1983.  The method utilized the fingerling collection and bypass system contained within the powerhouse.  Freeze-branded groups of smolts released upstream from the dam were used to calibrate the efficiency with which migrants were collected over a range of powerhouse discharge levels.  Application of collection efficiency calibration curves enables researchers and fisheries managers to generate daily estimates of smolt passage as a function of the amount of water discharged through the powerhouse and the number of fish collected in the bypass system.

URL1: The next link will exit from NWFSC web site<215:ETDPOJ>2.0.CO;2