This final environmental impact statement (EIS) analyzes the impacts of operations from 1963 to 1990 (baseline conditions) and alternative operations of Glen Canyon Dam on downstream environmental and cultural resources of Glen and Grand Canyons. Alternative operations evaluated include three that would provide steady flows and six, including no action, that would provide various levels of fluctuating flows. Additional measures have been combined with the alternative operations, where appropriate, either to mitigate adverse impacts of the alternative or to enhance resources. The EIS team and the cooperating agencies attempted to balance benefits to all resources in identifying a preferred alternative. As a result of comments on the draft EIS and discussions with the U.S.Fish and Wildlife Service,the preferred alternative described in the draft EIS was modified for the final EIS. The preferred alternative is the Modified Low Fluctuating Flow Alternative.
This final EIS was prepared in compliance with the National Environmental Policy Act and Bureau of Reclamation procedures and is intended to serve environmental review and consultation requirements pursuant to Executive Order 11988 (Floodplain Management), Executive Order 11990 (Wetlands Protection), National Historical Preservation Act (Section 106), Fish and Wildlife Coordination Act, and Endangered Species Act (Section 7c). This final EIS will be used by decision makers in the Bureau of Reclamation and the Department of the Interior and is provided for public information. A record of decision can be approved 30 days after publication of release of the final EIS in the Federal Register. Any decision regarding the operation of Glen Canyon Dam as well as opportunities for future public involvement will be well publicized.