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Executive Summary <br />FE/S - Navajo Reservoir Operations <br />Table S-5-Summary comparison of alternatives retained for further analysis (continued) <br />Resource <br />Native fisheries <br />(e.g., roundtail chub, <br />flannelmouth and <br />bluehead suckers, etc.) <br />Rafting recreation <br />downstream from <br />Farmington <br />Reservoir recreation <br />Reservoir fishery <br />Hydropower <br />Diversion structures <br />No Action Alternative <br />Has greater adverse <br />impact on native fishes <br />than action alternatives. <br />Overall flow regime <br />beneficial; however, <br />periods of flow below <br />500 cfs adversely affect <br />rafting. <br />Less impact than action <br />alternatives. <br />Less impact to reservoir <br />fishery than action <br />alternatives. <br />Existing hydropower <br />operations by city of <br />Farmington at Navajo <br />Dam would continue. <br />Existing diversions <br />protected by flood <br />control operations and <br />500 cfs minimum <br />releases from dam. <br />250/5000 Alternative <br />Reduced habitat in the <br />river reach between the <br />Hammond Diversion and <br />Farmington; habitat <br />improvement <br />downstream from <br />Farmington due to more <br />natural hydrograph. <br />Overall volume of flow <br />for rafting declines; <br />however, attempt to <br />maintain minimum <br />rafting flows near <br />500 cfs.3 <br />Generally recreation use <br />levels maintained; <br />reservoir drawdown <br />adversely affects quality <br />of recreation in dry <br />periods. <br />Minor adverse effects to <br />reservoir fishery due to <br />increased reservoir <br />drawdowns. <br />Reduced annual energy <br />production. Annual <br />hydropower replacement <br />cost up to $7 million. <br />Some existing diversions <br />need additional <br />operation and <br />maintenance to handle <br />high spring releases and <br />lower summer <br />minimums. <br />500/5000 Alternative <br />Some habitat improve- <br />ment downstream from <br />Farmington due to more <br />natural hydrograph. <br />Overall volume of flow <br />for rafting declines; <br />however, attempt to <br />maintain minimum rafting <br />flows near 500 cfs.3 <br />Generally recreation use <br />levels maintained; <br />reservoir drawdown <br />adversely affects quality <br />of recreation in dry <br />periods. <br />Moderate adverse <br />effects to reservoir <br />fishery due to increased <br />reservoir drawdowns. <br />Reduced annual energy <br />production. Annual <br />hydropower replace- <br />ment cost up to <br />$3.2 million. <br />Some existing diversions <br />need additional <br />operation and <br />maintenance to handle <br />high spring releases.