Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 7020
Title: Juvenile radio-tag study: Lower Granite Dam, 1985-86
Author/Editor: Albert E. Giorgi, Lowell C. Stuehrenberg, John W. Wilson
Publication Year: 1988
Publisher: National Marine Fisheries Service
Contracting Agency: Bonneville Power Administration. Portland, Oregon
Contract Number: DE-A179-85BP21237
Project Number: 85-38
Date: 1988

In 1985 and 1986, research was conducted at Lower Granite Dam to assess the feasibility of using a miniaturized radio tag for estimating spill effectiveness, fish guidance efficiency (FGE), collection efficiency (CE), and survival at the dam.  The results indicate that the tag can provide acceptable estimates of powerhouse and spillway passage, that FGE and CE estimates may be affected by the chinook salmon smolts inability to compensate for the tags weight, and that survival estimates could be frustrated by an inability to completely separate dead fish bearing live tags from live tagged fish moving downstream.  The passage model developed for Lower Granite Dam is applicable to other dams that have similar smolt passage configurations, and it can be adapted to situations with more passage routes.