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<br />[3 Executive Summary <br />S-22 <br />DElS - Navajo Reservoir Operations <br /> <br /> 250/5000 (Flow 500/5000 Alternative <br /> Recommendations) <br />Resource No Action Alternative Alternative <br />Trout fishery Maintains better Habitat reduced average Maintenance of 500 cfs <br /> downstream trout fishery of 34 percent in special maintains existing trout <br /> than action alternatives regulation waters when fishery, although water <br /> flows drop from 500 to shortage years may have <br /> 250 cfs. Physical habitat adverse habitat impacts. <br /> and water quality <br /> problems projected to be <br /> significant downstream <br /> from Citizens Ditch. <br />Trout fishery recreation Provides more Reduction in trout fishery Recreation maintained, <br /> recreation opportunities results in lower quality very infrequent water- <br /> than action alternatives. and/or quantity of short years have adverse <br /> recreation associated effects on quality and/or <br /> with trout fishing. quantity. <br />Native fisheries Has greater adverse Reduced habitat in the Some habitat <br />(e.g., roundtail chub, impact on native fishes river reach between the improvement <br />flannel mouth and than action alternatives. Hammond Diversion and downstream from <br />bluehead suckers, etc.) Farmington; habitat Farmington due to more <br /> improvement natural hydrograph. <br /> downstream from <br /> Farmington due to more <br /> natural hydrograph. <br />Rafting recreation Overalt flow regime Overall quality of flows Overall quality of flows <br />downstream from beneficial; however, for rafting declines; for rafting declines; <br />Farmington periods of flow below however, attempt to however, attempt to <br /> 500 cis adversely affect maintain 500 cis maintain 500 cfs <br /> rafting. minimum raftable flows. minimum raftable flows. <br />Reservoir recreation Less impact than action Generally recreation Generally recreation <br /> altematives. levels maintained; levels maintained; <br /> reservoir drawdown reservoir drawdown <br /> adversely affects quality adversely affects quality <br /> of recreation in dry of recreation in dry <br /> periods. periods. <br />ReselVoir fishery Less impact to reservoir Minor adverse effects to Moderate adverse <br /> fishery than action reselVoir fishery due to effects to reservoir <br /> alternatives. increased reservoir fishery due to increased <br /> drawdowns. reservoir drawdowns. <br />Hydropower Existing hydropower Reduced annual energy Reduced annual energy <br /> operations by City of production. Annual production. Annual <br /> Farmington at Navajo hydropower replacement hydropower replace- <br /> Dam would continue. cost up to $7 million. ment cost up to <br /> $3.2 million. <br /> <br />Tabie S-S-Summary comparison of alternatives retained for further anaiysis (continued) <br /> <br />I <br />