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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.
More precisely, according to the BC Freshwater Atlas, the Columbia River in British Columbia is 760.356 kilometers long (472.463 miles). For its first approximately 150 miles (241 kilometers) in the United States, the Columbia forms the reservoir behind Grand Coulee Dam.