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Environmental <br />Reservoir construction <br />stored water and <br />restrictions may <br />produced power but <br />also changed river <br />conditions. Rather <br />call for holding <br />than turbulent spring floods followed by low <br />summer and winter flows, reservoirs now <br />water when <br />store and conserve water for release <br />throughout the year. Clear, cool water and <br />power demands <br />consistent flows below dams create some of <br />the nation’s best trout fisheries. But these <br />non-native sport fish replaced native fish like <br />are high and <br />Fly fisher downstream of Glen Canyon Dam - by Terry Gunn, courtesy of the <br />Bureau of Reclamation <br />the Colorado pike minnow, razorback sucker, <br />humpback chub and bonytail chub, which are now listed under the Endangered Species Act <br />releasing water <br />(ESA). <br /> Federal environmental laws like the ESA, the Clean Water Act and the National <br />when demands are <br />Environmental Policy Act (NEPA) present significant challenges to the generation of <br />hydropower resources in the CRSP. Some cite t hese laws as justification to operate reservoirs <br />to mimic pre-dam conditions. This undermines the purposes for which the reservoirs were <br />low, reducing the <br />constructed. For example, reservoir releases to mimic pre-dam floods, or move sediment, often <br />bypass power turbines and waste the opportunity to produce hydropower. <br />ability to <br />CRSP Generation Before Glen Canyon ROD and <br />produce <br />Flaming Gorge BO <br />power . <br />1,600 1,600 <br />1,200 1,200 <br />Aspinall <br />Flaming Gorge <br />800 800 <br />Glen Canyon <br />Load <br />400 400 <br />0 0 <br />SunMonTueWedThuFriSat <br />Day of Week <br />Courtesy of Western Area Power Administration <br /> 10 <br />