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The legal limit for Columbia water temperature is 68 degrees to protect salmon and steelhead in the mainstem of the river (itâs lower in tributaries and spawning grounds). Over the past two years, Columbia Riverkeepr volunteers found 70-degree water in much of the mainstem.
That means cold water refugia becomes critically important, but a lot of the Columbia is reaching these high temperatures.â Agnes Lut, Columbia River coordinator for the Oregon Department of Environmental Quality, said yes, her agency knows temperatures on the Columbia are exceeding the Clean Water Act limits. And not just in the past two years, she said. Itâs been this way since at least 2000.