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Columbia River electric generation in 2018 remains normal despite above-normal water flow
During the 2018 water year that ended September 30, 2018, The Dalles Dam in the Pacific Northwest experienced above-normal inflow—water volume flowing into the dam—but electricity generation from the dam remained relatively normal. The difference between the two is attributed to spilled flow, or water diverted past the dam without generating power. Monthly inflow at The Dalles Dam peaked in May, reaching 63% above normal, but more than half of that volume was spilled, some of which was likely required by a recent court order.

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