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Why are the shad ladder counts higher at The Dalles Dam than Bonneville?

April 26, 2017bonneville counts dalles Dam ladder shad

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Why are the shad ladder counts higher at The Dalles Dam than Bonneville?

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When the shad first appear in May they tend to go through the locks at Bonneville, rather than using the fish ladder and therefore are not counted. As the season progresses the numbers will rise at Bonneville, bringing it more in line with the count at The Dalles Dam.