NOAA: Highest Spill Levels Ever For Juvenile Salmonids Makes Smolt Detection Difficult In 2021, Imprecise Reach Survival Estimates

Environmental conditions and management actions in 2021 resulted in a year with low flow, warmer than average water temperatures and an extremely high percentage of spill for fish during the spring migration season, according to a recent NOAA Fisheries preliminary memorandum on juvenile salmon and steelhead survival through Columbia and Snake river dams.

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