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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.
Columbia River, Columbia River GorgeÂ© Corbislargest river flowing into the Pacific Ocean from North America. It is exceeded in discharge on the continent only by the Mississippi, St. Lawrence, and Mackenzie rivers. The Columbia is one of the worldâs greatest sources of hydroelectric power and, with its tributaries, represents a third of the potential hydropower of the United States. In addition, its mouth provides the first deepwater harbour north of San Francisco.