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Patterns of Larval Sucker Emigration from the Sprague and Lower Williamson Rivers of the Upper Klamath Basin, Oregon, Prior to the Removal of Chiloquin Dam
Creator
Craig M. Ellsworth Torrey J. Tyler Scott P. VanderKooi Douglas F. Markle
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Description
Scope/Content: Abstract: Chiloquin Dam was located at river kilometer (rkm) 1.3 on the Sprague River approximately 19 rkm upstream of Upper Klamath Lake. The dam was approximately 3.4 m high and 58 m wide and was constructed to serve as a diversion structure to supply irrigation water for the Modoc Point Irrigation District. The dam was identified as a significant barrier to fish migration on the Sprague River, and in some years, prevented the upstream spawning migrations of KLS, LRS, SNS, and other fish species (U.S. Fish and Wildlife Service, 2002; National Research Council, 2003). In 2000, the U.S. Geological Survey implemented a sampling program at the Chiloquin Dam fish ladder to monitor the composition, timing, and relative abundance of spring spawning runs of suckers in the Sprague River as part of a larger effort to monitor LRS and SNS populations in the Upper Klamath Basin (Shively and others, 2001). Regular sampling has shown that the number of suckers entering the fish ladder can be highly variable between years. Some movement of KLS, LRS, and SNS through the Chiloquin Dam fish ladder has been documented during their respective spawning seasons, and eggs and larvae tentatively identified as belonging to each of these species have been collected upstream of the dam (Klamath Tribes, unpub. data, 1996; Perkins and others, 2000). Scope/Content: Author affiliation: U.S. Geological Survey; Bureau of Reclamation; Oregon State University Scope/Content: Height: 3.4 m. Length: 58 m. Scope/Content: Date constructed: 1914. Date removed: 2008.
Type
text
Identifier
ark:/86086/n2j38s7n 808
Subject
Pre- and post-project monitoring Dams Dam retirement
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