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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.
Inadequate rainfall was a problem but the abundance of water in the Columbia River was the answer. The solution was to build a concrete dam across the Columbia River to raise the water level and divert it south into the Grand Coulee, an immense natural channel which was carved by the Ice Age Floods.