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<br />I <br />I <br />- <br />I <br />I <br />. <br />. <br /> <br />section I: <br /> <br />section II: <br /> <br />. <br />I <br />I <br /> <br />. <br />I <br />I <br />I <br /> <br />TABLE OF CONTENTS <br /> <br />Introduction . . . . . <br /> <br />1 <br /> <br />The Glen Canyon Environmental <br />Studies Assessed The Impact Of <br />Dam Operations ..... <br /> <br />1 <br /> <br />Studies provide Basis For <br />Secretarial Decision . . . <br /> <br />5 <br /> <br />Over Thirty Studies Are Integrated <br />In This Final Report . . . . . . . <br /> <br />6 <br /> <br />Motivation And Background For The <br />Studies . .. ..... <br /> <br />9 <br /> <br />Valued Environmental And <br />Recreational Resources Exist Below <br />Glen Canyon Dam . .. ... 9 <br /> <br />Flow In The Colorado River Through <br />Glen And Grand Canyon Is Controlled <br />By Glen Canyon Dam . . . . . . .. 9 <br /> <br />Fluctuating Releases From The Dam <br />Caused Public Concern .... . 10 <br /> <br />Large Releases From Glen Canyon <br />Dam Are More Common Since The <br />Filling Of Lake Powell And Are A <br />Cause Of Public Concern . . . 12 <br /> <br />Reduced River Temperature Resulting <br />From Construction Of Glen Canyon Dam <br />Diminished Habitat For Humpback Chub 12 <br /> <br />Our Understanding Of The <br />Relationships Between Dam <br />Operations And Downstream <br />Resources Is Not Complete <br /> <br />13 <br /> <br />I <br /> <br />section III: Setting And Resources Studied <br /> <br />17 <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br />Study Targeted Critical Resources 17 <br /> <br />The Critical Resources Are Humpback <br />Chub, Common Native Fish, Rainbow <br />Trout, camping Beaches, Riparian <br />Vegetation And Wildlife, White-Water <br />Boating, And Trout Fishing. . . . . 17 <br />