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Executive Summary <br />FEIS - Navajo Reservoir Operations <br />Table S-5-Summary comparison of alternatives retained for further analysis (continued) <br />Resource No Action Alternative 250/5000 Alternative 500/5000 Alternative <br />Reservoir vegetation and <br />wildlife <br />Land use <br />Cultural resources <br />Flood control and <br />erosion <br />Less impact to existing <br />wetland and riparian <br />vegetation and <br />associated wildlife <br />habitat as compared to <br />action alternatives. <br />Current land uses not <br />affected by reservoir <br />operations. Possibly <br />no future production <br />of Blocks 7 and 8 <br />(10,500 acres). Possibly <br />no development of <br />Blocks 9 - 11 <br />(45,630 acres) of NIIP <br />lands. <br />Reservoir fluctuations <br />continue to impact <br />cultural resources in <br />reservoir basin. <br />Flood control operations <br />of Navajo Dam met; <br />maximum releases <br />limited to 5,000 cfs. <br />Minimal additional <br />impacts to wetland and <br />riparian vegetation and <br />associated wildlife <br />habitat associated with <br />greater reservoir <br />fluctuations. <br />Blocks 9 - 11 <br />(45,630 acres) of <br />additional irrigation land <br />developed under NIIP. <br />Blocks 7 and 8 <br />(10,500 acres) would <br />continue under <br />production. <br />Reservoir fluctuations <br />impact cultural <br />resources; impact less <br />than No Action and <br />500/5000 Alternatives. <br />Flood control operations <br />of Navajo Dam met; <br />maximum releases <br />limited to 5,000 cfs; <br />increased frequency of <br />releases of 5,000 cfs <br />would cause bank <br />erosion until river <br />stabilized itself or banks <br />stabilized. <br />Moderate additional <br />impacts to wetland and <br />riparian vegetation and <br />related wildlife habitat <br />associated with greater <br />reservoir fluctuations. <br />Possible reduction of full <br />NIIP development. <br />Reservoir fluctuations <br />impact cultural <br />resources; impact less <br />than that of No Action <br />but greater than that of <br />250/5000 Alternative. <br />Flood control operations <br />of Navajo Dam met; <br />maximum releases <br />limited to 5,000 cfs; <br />increased frequency of <br />releases of 5,000 cfs <br />would cause bank <br />erosion until river <br />stabilized itself or banks <br />stabilized.