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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.
of 25.1DC for juvenile chinook salmon, experiÂ­ mentally determined (Brett, 1952). The annual volume of river flow in the central Columbia River ranges from about 40,000 to over 300,000 cfs (1,133-8,500 m3/sec). Flows are low during the fall and winter, but increase and peak during April, May, and June due to the seasonal runoff of the spring freshet.