20 years, the river exceeded 68 degrees 64 or more days per year at

Harbor dam, and seven of 20 years at Lower Granite Dam. The scroll
data showed exceedences like that in only three of the 20 years at
“The dams have resulted in significant change in the energy budget of
the lower Snake River,” EPA says. “The instantaneous daily water
temperatures may be greater under some conditions in the natural river
than in the impounded river, but high water temperatures in the natural
river don’t last as long seasonally as the high water …

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