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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.
With an average flow at the mouth of about 265,000 cubic feet per second (7,500 m3/s), the Columbia is the largest river by volume flowing into the Pacific from North America and is the fourth-largest by volume in the US.