Relative survival of juvenile salmon passing through the spillway of The Dalles Dam, 1997

Dawley, Earl M.; Gilbreath, Lyle G.; Nunnallee, Edmund P.; Sandford, Benjamin P.

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Relative survival of juvenile salmon passing through the spillway of The Dalles Dam, 1997

1998
By Dawley, Earl M. ; Gilbreath, Lyle G. ; Nunnallee, Edmund P. ; ...

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Personal Author:

Dawley, Earl M. ; Gilbreath, Lyle G. ; Nunnallee, Edmund P. ; Sandford, Benjamin P.
Corporate Authors:

Northwest Fisheries Science Center (U.S.). Fish Ecology Division. ; United States. Army. Corps of Engineers. Portland District.
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)
Description:

In 1997, the National Marine Fisheries Service initiated a study at The Dalles Dam to evaluate survival ofjuvenile Pacific salmon (Oncorhynchus spp.) when 64% ofthe river flow was passed through the spillway. The high spill is presumed to provide increased protection for the migrants. Research has generally found that survival offish passed through spillways at dams on the Columbia and Snake Rivers is higher than for fish passed through turbines. However, at The Dalles Dam, two conditions associated with the spillway under high spill levels are unlike other dams: 1) the stilling basin is shorter and the tailrace is shallower, resulting in severe turbulence that may cause physical injury to migrant salmon; and 2) the large proportion ofwater that passes through the shallow area may substantially increase predation on salmonids by gulls, {Lams spp.) and northern squawfish (Ptychocheilus oregonensis).
Keywords:

Effect Of Dams On Migration Pacific Salmon Research Effect Of Dams On Pacific Salmon
Format:

PDF
Document Type:

Non-series Report
Funding:

Contract no. MIPR E96970020
Place as Subject:

Dalles Dam (Or. and Wash.) ; Columbia River
License:

https://creativecommons.org/publicdomain/zero/1.0/
Rights Information:

CC0 Public Domain
Compliance:

Submitted
Main Document Checksum:

urn:sha-512:e0a82b49059080121751c6be66e5bc621ca67683e118bb2180c0a2c62ae2584581f420a4a4036d3e5f1feb816bf48cc47f338a608462cac096d2314aecc2e26f
Download URL:

https://repository.library.noaa.gov/view/noaa/50162/noaa_50162_DS1.pdf
File Type:

[PDF - 17.30 MB ]

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