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<br />Contents <br /> <br />Page <br /> <br />Chapter I Purpose (If and Need for Action <br />Purpose and Need .......................... .'. . . . . . . . . . . . . . . . . 1 <br /> <br />Background. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 <br />Permits Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 <br />Scoping Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 <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 Alternative 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 ............. 15 <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 ...................................... 26 <br />Environmental Consequences ...........:.................... 29 <br />Vegetation and Wildlife. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 <br />Affected Environment ...................................... 30 <br />Environmental Consequences ................................ 33 <br />Endangered and Other Special Status Species ...... . . . . . . . . . . . . . . . . . 35 <br />Affected Environment ...................................... 35 <br />Environmental Consequences ................................ 38 <br />Cultural Resources ........................................... 42 <br />Affected Environment ...................................... 42 <br />Environmental Consequences ................................ 43 <br /> <br />Recreation ........ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 <br />Affected Environment ...................................... 44 <br />Environmental Consequences ................................ 4S <br /> <br />Hydropower ................................................ 47 <br />Affected Environment ...................................... 47 <br />Environmental Consequences ................................ 49 <br /> <br />vii <br />