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<br />'~ <br />_', J <br /> <br />,......""1:. <br />,;.-~,~ .;) <br /> <br />~ <br />y <br />., <br />r <br />~.; <br />, <br />~: <br /> <br />SUMKARY AND PRINCIPAL CONCLUSIONS <br /> <br />. <br />'.-; <br />"r;' <br />.::' <br /> <br />Int.r-Ag.ncy Study A......d Impacts Of Glen Canyon <br />Daa op.ration. <br /> <br />This report presents the findings of the Glen Canyon <br />Environmental Studies (GCES). In December of 1982, the <br />Secretary of the Interior directed the Bureau of <br />Reclamation (BOR) to initiate a multi-agency study to <br />address the concerns of the public and other federal <br />and state agencies about possible negative effects of <br />the operations of Glen Canyon Dam on downstream <br />environmental and recreational resources. This studv <br />was not intended nor desianed to lead directlv to <br />chanaes in dam ooerations. Any decision to make <br />operational changes would require feasibility studies <br />and National Environmental Policy Act (NEPA) compliance <br />activities to assess the impact of those changes on the <br />primary mandate of the Colorado River Storage Project <br />(water storage and delivery), power generation, and <br />economic considerations, as well as on the environment <br />and recreation. <br /> <br />,. <br />~.." <br /> <br />~'" <br /> <br />., <br />~-'- <br />';" <br /> <br />,4 <br />;~ <br />i.!:. <br />I'~ <br />---;. <br /> <br />:'~_. <br /> <br />The GCES study goals were, first, to investigate the <br />impact of several aspects of current dam operations on <br />the existing environmental and recreational resources <br />in the Glen canyon National Recreation Area and Grand <br />Canyon National Park--specifically the effect of very <br />high, very low, and strongly fluctuating releases from <br />the dam. Second, if adverse impacts to downstream <br />resources were found, the study was to determine <br />whether modifications made to dam operations, within <br />the constraints of Colorado River Storage Project water <br />delivery requirements, could reduce those impacts. <br />These modifications were to be based on environmental <br />needs and did not include a full economic, cost-benefit <br />analysis. To accomplish the study goals, over 30 <br />technical studies in the fields of biology, recreation, <br />and sediment and hydrology were conducted by over 100 <br />researchers. <br /> <br />,:'" <br /> <br />i- <br /> <br />~ -~ <br />:.:.. . <br /> <br />I~:.. <br />:/. <br /> <br />'.;:'.' <br /> <br />'.~ <br />'...-.,\ <br />. <br /> <br />\>:"!i. <br />~ <br />~~ <br />i~1 <br />:'1:1 <br />..': <br />:."/ <br /> <br />,,) <br />