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<br />GLEN CANYON DAM INTERIM FLOWS
<br />DRAFT ENVIRONMENTAL ASSESSMENT
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<br />CONTENTS
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<br />Page
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<br />Table of Contents ......"",.,...",."""..",...., i
<br />Tables "".." , , , , , , , , , , .. .. , , , .. , .. , .. .. , , , , , , , , .. iii
<br />Figures ..,..,....""""..,.."....",..,"",..,' ill
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<br />CHAPI'ER 1 Purpose and Need, , , , , , , , , , , , , , , , , , , , . . . , , I-I
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<br />Background .,.."",."""..""....",.".,.", I-I
<br />Development of Alternatives .,.""""""""...." I-I
<br />Other Related Actions ........""""""...""", 1-4
<br />Glen Canyon Dam EIS . . , , , . . . , . , , , . , , , . . . , , , , . . . , 1-4
<br />Glen Canyon Environmental Studies , , , , , , , , , , , , , , , , , 1-4
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<br />Western's EIS ........",.""""""..'""", 1-4
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<br />CHAPI'ER 2 Proposed Action and Alternatives, , , . . . , , , , , , , II-I
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<br />No Action. . , , . , , . . , , , , , , . . , , , . . , , . , , , , , , , . , . . , , , , II-I
<br />Low Fluctuating Flow Alternative
<br />(Proposed Action) . , , , , , , . , , , , , , , , , , , . . , , , , , , , , , , , , II-I
<br />Financial Exception Criteria Option ",..""",."" II-2
<br />Flow Monitoring Program ..",....""..""",.., II-3
<br />Alternatives Considered but Eliminated, , , , . . , . , , , , , , . . , II-4
<br />Intermediate Fluctuating Flow Alternative "",...",. II-4
<br />Sustained Fluctuating Flow Alternative, , , , , , . , , . . , , , . II-4
<br />Environmental Impacts ..",..""",.""..,.""., II-4
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<br />CHAPI'ER 3 Affected Environment and
<br />Environmental Consequences .",."""..."",...,... III-l
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<br />Introduction. , . . . . . , , . . . , , , . , , , , , , , , , . , . , , , , , . , , , , III-I
<br />Assumptions .",...."...",."",."""",," III-I
<br />Location, , . , , , , . . . , , . . . . , , . . , , , , , , , , , . , , , , , , , . , III-3
<br />Immediate Area ""...",...,..""...",',., III-3
<br />Area of General Influence , . , , , . . , , , . , , , , , , . , , , , . III-3
<br />Colorado River Flows , , , , , , , , , , , , , . , , , , , , , , , , , , , , , III-3
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<br />Resources ,..""..."""""""""",,",., III-3
<br />Sediment " , . , , , , , . , , , , . . . , , , . , , . . , , , , , , , , , , , , , , , III-5
<br />Affected EnvironmentINo Action
<br />Alternative Consequences "",."""".""",,' III-5
<br />Erosion of Sand Bars ,..,.."""""","',.., III-5
<br />Replenishment of Sand Bar Deposits ""',"",'" III-7
<br />Low Fluctuating Flow Alternative
<br />Consequences ",.."",."",."""""",'" III-B
<br />Erosion of Sand Bars "."""."",..""..,.. III-B
<br />Replenishment of Sand Bar Deposits ","","'," III.B
<br />Financial Exception Criteria Option , , , , , , . , , , , . , , , III-9
<br />Biological Resources . , , , . , , , , , , , , , , , , , , , , , , , , , , , , , . , III-9
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<br />Vegetation. , , . , , , , , , , , , , . . , , , , , , , , , . , , , , , . , , , , , III-9
<br />Affected EnvironmentINo Action
<br />Alternative Consequences , , . . . , , , , , , , , , , , , , , , , . III-9
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