Warm waters killed chinook in Oregon’s John Day River in July. Even Idaho’s Salmon River got too hot. Can the fish adapt quickly enough?

Research shows that salmon avoid water that’s warmer than 68 degrees. For years temperatures in the Columbia River have exceeded that for brief periods in the summer. But from July 22 to July 28, water temperatures reached at least 70 at four federal dams on the Columbia and Snake rivers that are passable to salmon. @idahostatesman.com

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