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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.
What is the depth of the Columbia River? The depth of the Columbia River ranges from 20 feet to 170 feet at various points along its route, and its total length is 1,243 miles. Locks, dams and reservoirs built on the Columbia River alter its depth.