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Executive Summary J?, FE/S - Navajo Reservoir Operations I 'A Comparison of Alternatives Table S-5 summarizes the impacts associated with each alternative retained for detailed analysis. Table S-5-Summary comparison of alternatives retained for further analysis' 2 Resource No Action Alternative 250/5000 Alternative 500/5000 Alternative Navajo Reservoir Reservoir operated for Reservoir operated Reservoir operated for operations and content flood control and existing for flood control, flood control and uses; average July endangered fish, full endangered fish, content 1.52 million NIIP water supply; potential shortage to acre-feet. average July content NIIP water supply; 1.35 million acre-feet. average July content 1.3 million acre-feet. San Juan River monthly Minimum flow 500 cfs; Minimum flow 250 cfs; Minimum flow 500 cfs; flows at Archuleta (near average annual flow of average annual flow of average annual flow of dam) 1,015 cfs; average July 775 cfs; average July 780 cfs; average July flow 1,050 cfs; average flow 385 cfs; average flow 540 cfs; average January flow 880 cfs. January flow 300 cfs January flow 500 cfs. Lower San Juan River Minimum flow 65 cfs; Minimum flow 500 cfs;' Minimum flow <100 cfs monthly flows average annual flow of average annual flow of when reservoir storage 1,900 cfs; average June 1,670 cfs; average June exhausted;' average flow 4,250 cfs; average flow 4,680 cfs; average annual flow of 1,670 cfs; August flow 1,570 cfs. August flow 1,110 cfs. average June flow 4,110 cfs; average August flow 1,170 cfs. Water uses and Water supply adequate Water supply adequate Water supply adequate resources to meet existing uses; to meet existing uses; to meet existing uses future water uses completion of NIIP and with possible shortages including NIIP ALP Project would in dry years; completion completion and ALP occur. Best opportunity of NIIP and ALP Project Project is uncertain. to accomplish future included with possible water development. shortages.