Historic water temperature (1924-2018), river discharge (1929-2018), and adult sockeye salmon migration observations (1937-2018) in the Columbia, Okanogan, and Okanagan Rivers / by Kim D. Hyatt, Howard... : Fs97-4/3206E-PDF

"Historical meteorological and hydrological data were assembled to review the influence of environmental factors on patterns of adult Sockeye Salmon migration, as enumerated at Zosel Dam in the Okanogan River, WA, en route to spawning grounds in the Okanagan River, BC. We identify three locations of vulnerability for Okanagan Sockeye Salmon along the migration corridor as likely 'control points' exerting a disproportionate impact on upstream migration success: (1) the warmest segments of the lower Columbia River, associated with Bonneville and John Day dams; (2) Pateros Lake, above Wells dam in the mid-Columbia where salmon may hold before entering the Okanogan watershed; and (3) the 185-km Okanogan River, where summer water temperatures are typically 3-5°C warmer than Pateros Lake"--Abstract, page xiv.

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