Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 7790
Title: Louver efficiency in deflecting downstream migrant steelhead
Author: Daniel W. Bates, Stanley G. Jewett
Publication Year: 1961
Journal: Transactions of the American Fisheries Society
Volume: 90
Issue: 3
Pages: 336-337

A louver facility constructed early in 1960 in Maxwell Irrigation Canal, Umatilla River, Oregon, proved very effective in deflecting immature migrating steelhead.  The principles of employing louvers to deflect fish were originally studied and demonstrated to be of practical application at the Tracy Pumping Plant near Tracy, California.  The Maxwell installation has demonstrated that the principles incorporated in the Tracy structure for deflecting chinook salmon and striped bass in a canal with a total flow capacity of 5,000 cfs are equally applicable for deflecting young steelhead in a canal with a maximum flow capacity of 100 cfs.

The installation had the double purpose of serving as an experimental facility and of providing an economical means of diverting steelhead from the irrigation system served.  It included both a vertical and a horizontal louver section.  Study of the horizontal 1ouver section provided information of value, but since the depth of the canal precluded a satisfactory evaluation of its effectiveness for diverting young steelhead, it is not discussed at length in this report.

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