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e . . MANAGEMENT PLAN FOR PREPARATION OF GLEN CANYON DAM ENVIRONMENTAL IMPACT STATEMENT PURPOSE The purpDse of this management plan is to guids the Bureau of ReclamatiDn (Reclamation) and cooperating agencieB through the process of carrying out the preparation Df the Glen Canyon Dam Environmental Impact Statement (EIS). The management plan will be used to communi- cate the overall intent and respDnsibilities. Since ths EIS process is dynamic and subject to change, the document will be revised as needed and circulated to all appropriate entitieB and individualB. BACKGROUND Glen Canyon Dam waB completed in 1963, prior to the passage of the National Environ- mental Policy Aet (NEPAl. Consequently, nD requirement existed for an EIS on the project. In December 1982, Reclamation published an environmental aBsessment on the impacts of a propoBed uprate and rewind program for the dam. ReclamatiDn proceeded with the uprate and rewind project but agreed not to use the increased powerplant capacity for flows above 31,500 cubic feet per second (fts/s) until completiDn ofa more comprehensive study. Beginning in December of 1982, Reclamation initiated the multiagency Glen CanYDn Environmental Studies (GOES) to address the concerns of the public and other Federal and State agencies about possible negative effects of the operations of Glen Canyon Dam on the existing downstream environmental and recreational resources. Two previous Reclamation studies focused attention on the current operational effects and forwarded proposals for future changes. Both the Peaking Power Study and the Uprate and Rewind Study suggested the possibility fDr change in plant capacity and rates Dfwater release. Information currently availabls frDm GOES has identified three known relationsbips: 1. Glen Canyon Dam has had an impact on the downstream Glen CanYDn and Grand Canyon resourceB. ChangeB have occurred and cDntinue to occur to many of the sensitive ecosystem resources. Some changes are considered positive, and Bome are negative. 2. For negative impacts, operations and management may be mDdified to minimize losseB of some resources in the canyon and to protect and enhance others. 3. The canyon is a dynamic reBource and, with careful management, may be able to gradually reestablish mDre harmoniDus environmental relationsbipB. The Department will use the EIS to comply with statutory requirements to produce hydropower, to protect tribal interests, and to conserve the Park's and the Recreation Area's resources for the enjoyment of future generations. OBJECTIVES OF THE GLEN CANYON DAM EIS The primary objective of the Glen Canyon Dam EIS is to evaluate the impacts of current and alternative dam operations on the downstream environmental and ecological resources of the Glen Canyon National Recreational Area and Grand Canyon 1