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Scope/Content: Abstract: The U.S. Environmental Protection Agency (EPA) has re-evaluated its decisions concerning several waters addressed in California's 2006 Clean Water Act Section 303(d) List submittal. Specifically, we have reconsidered our prior approval of the omission of microcystin toxin listings for three segments of the Klamath River, and have determined to add a listing for microcystin toxin for one of those segments. Scope/Content: Date constructed: 1962.