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<br />.I" <br /> <br />Contents <br /> <br />Page <br /> <br />Chapter I Purpose of and Need for Action <br /> <br />Purpose and Need """"""."."""""".""""""" 1 <br />Background, . . , , , , . . , , , , , . , , , , , , , . , . , . , , , , , , , . , , , , , , , , , , , , . , 2 <br />Relationship to National Park Service Resource <br />Management Objectives , , , , , , , , , , , , , , , , , , , , , , , , , . , , , , , , , , , , , , 3 <br /> <br />Permits Required , , , . . , , , , . , , , , , , , , , , , , , , , , . . , , , , , , , , , , , , , , . , , 3 <br />5coping Summary , .. , , , .. , , , .. .. .. , , , , , , , , , , , .. , . . . . , , , , , , , , , 4 <br /> <br />Chapter II Description of Alternatives "" , . , . , . , , , , , , , , . , , , , , , , , , . , 5 <br /> <br />No Action ,.""" , , , , , , , . , , , , , , . , , , , , , , , , , , , . , , , , , , , . , , , , , , 5 <br />Proposed Action """""",..."""""""""""""", 7 <br />Mitigation ."""".,.""..""""".,.,."",.""",.", 10 <br />Alternatives Considered but Eliminated From Detailed Analysis ,..'"" 10 <br />Summary Comparison of Alternatives and Impacts . , . , , , , , , , . . , , , , , , , 11 <br /> <br />Chapter III Affected Environment and Environmental Consequences. , , , , , 13 <br />Colorado River System Resource linkages ",.,....""",."""" 13 <br />Water Volume and Pattern of Release .......,."",.,."""", 15 <br />Sediment Transport and Its Effect on Other Resources "",...."., 16 <br />Flows, Sediment, and Downstream Resources . . . , , , , , , , . . , , , , , , , , 16 <br /> <br />Water """,.."",..."".,.",.,.,.,.,."",.,..""".. 18 <br />Affected Environment ",.""".".,."""..,.",.,.,."" 18 <br />Environmental Consequences ...""""....""".,."",.,. 19 <br /> <br />Sediment ....."",..."".."",.,.,.....,....,.."",.... 21 <br />Affected Environment "...,.",.,....."",...""".,...., 21 <br />Environmental Consequences .....""......""".,."""" 23 <br /> <br />Fish , , , , , , , . , . . . . . , . . . . , , , . . . . . , , , , . , , . . , . , , , , , . , . , , , , , . , . , 26 <br />Affected Environment ",....",.,..,.."",....",.,."..,. 27 <br />Environmental Consequences ".,.."""".,."",...""", 29 <br />Vegetation and Wildlife, , , . . , , , . . . . . . , , , . , , , , , , , , , , . . . , . , , , , , , , 31 <br /> <br />Affected Environment .""...."",.",.,.,.,...""",.", 31 <br />Environmental Consequences ".....""",...""",.,....., 34 <br />Endangered and Other Special Status Species "",.""""".,.,.., 36 <br />Affected Environment ",.,.....""",.,...""",.,...,.,. 36 <br />Environmental Consequences ",.,..',."""""".".""" 39 <br />Cultural Resources ",.,...."",...,..."""".,.,.,.""", 44 <br />Affected Environment ",.,.,...,.""""".",..""".", 44 <br />Environmental Consequences ",.",....."""""....""" 4S <br /> <br />Recreation """"".,."""",.,..' , . , , , . , , , . , , , . , . , . , , , , , 46 <br />Affected Environment """,.,.,.,.""""".,.",.,..",. 46 <br />Environmental Consequences """",.".,...""""""", 47 <br /> <br />Hydropower ",.,.",.""""""""""""..,.."""", 50 <br />Affected Environment """"".",.'""".,...,.,.,."", 50 <br />Environmental Consequences ,.""",.,.."..,.,."."""" 52 <br /> <br />vii <br />