Fall Chinook Salmon Spawning Ground Surveys in the Snake River Basin Upriver of Lower Granite Dam, 2007 Annual Report. Page: 3 of 62
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Introduction
Redd counts are routinely used to document the spawning distribution of fall Chinook salmon
(Oncorhynchus tshawytscha) in the Snake River basin upriver of Lower Granite Dam. The first reported
redd counts were from aerial searches conducted intermittently between 1959 and 1978 (Irving and
Bjornn 1981, Witty 1988; Groves and Chandler 1996)(Appendix 1). In 1986, the Washington Department
of Fish and Wildlife began an annual monitoring program that, in addition to the Snake River, included
aerial searches of the Grande Ronde River the first year (Seidel and Bugert 1987), and the Imnaha River
in subsequent years (Seidel et al. 1988; Bugert et al. 1989-1991; Mendel et al. 1992). The U. S. Fish
and Wildlife Service and Idaho Power Company began contributing to this effort in 1991 by increasing the
number of aerial searches conducted each year and adding underwater searches in areas of the Snake
River that were too deep to be searched from the air (Connor et al. 1993; Garcia et al. 1994a, 1994b,
1996-2007; Groves 1993; Groves and Chandler 1996). The Nez Perce Tribe added aerial searches in
the Clearwater River basin beginning in 1988 (Arnsberg et. al 1992), and the Salmon River beginning in
1992. Currently searches are conducted cooperatively by the Nez Perce Tribe, Idaho Power Company,
and U. S. Fish and Wildlife Service.
Our objective for this report was to consolidate the findings from annual redd searches counted upstream
of Lower Granite Dam into a single document, containing detailed information about the searches from
the most recent spawning season, and summary information from previous years. The work conducted in
2007 was funded by the Bonneville Power Administration and Idaho Power Company.
Study Area
The study area included the un-impounded section of the Snake River between Lower Granite and Hells
Canyon dams and portions of the major tributaries that enter therein (Figure 1). We refer to locations
using river miles (RM) and river kilometers (RK) based on navigation charts of the Snake River (USACE1
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Garcia, A.P.; Bradbury, S.; Arnsberg, B.D. & Groves, P.A. Fall Chinook Salmon Spawning Ground Surveys in the Snake River Basin Upriver of Lower Granite Dam, 2007 Annual Report., report, November 25, 2008; Portland, Oregon. (https://digital.library.unt.edu/ark:/67531/metadc931974/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.