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<br />.I"
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<br />Contents
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<br />Page
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<br />Chapter I Purpose of and Need for Action
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<br />Purpose and Need """"""."."""""".""""""" 1
<br />Background, . . , , , , . . , , , , , . , , , , , , , . , . , . , , , , , , , . , , , , , , , , , , , , . , 2
<br />Relationship to National Park Service Resource
<br />Management Objectives , , , , , , , , , , , , , , , , , , , , , , , , , . , , , , , , , , , , , , 3
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<br />Permits Required , , , . . , , , , . , , , , , , , , , , , , , , , , . . , , , , , , , , , , , , , , . , , 3
<br />5coping Summary , .. , , , .. , , , .. .. .. , , , , , , , , , , , .. , . . . . , , , , , , , , , 4
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<br />Chapter II Description of Alternatives "" , . , . , . , , , , , , , , . , , , , , , , , , . , 5
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<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
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<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
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<br />Water """,.."",..."".,.",.,.,.,.,."",.,..""".. 18
<br />Affected Environment ",.""".".,."""..,.",.,.,."" 18
<br />Environmental Consequences ...""""....""".,."",.,. 19
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<br />Sediment ....."",..."".."",.,.,.....,....,.."",.... 21
<br />Affected Environment "...,.",.,....."",...""".,...., 21
<br />Environmental Consequences .....""......""".,."""" 23
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<br />Fish , , , , , , , . , . . . . . , . . . . , , , . . . . . , , , , . , , . . , . , , , , , . , . , , , , , . , . , 26
<br />Affected Environment ",....",.,..,.."",....",.,."..,. 27
<br />Environmental Consequences ".,.."""".,."",...""", 29
<br />Vegetation and Wildlife, , , . . , , , . . . . . . , , , . , , , , , , , , , , . . . , . , , , , , , , 31
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<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
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<br />Recreation """"".,."""",.,..' , . , , , . , , , . , , , . , . , . , , , , , 46
<br />Affected Environment """,.,.,.,.""""".,.",.,..",. 46
<br />Environmental Consequences """",.".,...""""""", 47
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<br />Hydropower ",.,.",.""""""""""""..,.."""", 50
<br />Affected Environment """"".",.'""".,...,.,.,."", 50
<br />Environmental Consequences ,.""",.,.."..,.,."."""" 52
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<br />vii
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