Environmental Assessments

Operation of Glen Canyon Dam
Final Environmental Statement

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 document is often used by decisionmakers within the Bureau of Reclamation and Department of the Interior. It is an example of cooperative efforts between governmental agencies and Native American tribes to conserve our environment and meet the needs of a rapidly changing West.

When the document is loaded into Adobe Acrobat, click on the title of the document. This will take you to the cover sheet and contents of the document. From the "Contents," you can navigate throughout the document by clicking on the section needed. The headers at the top of the chapters will return you to the main contents. The content cover sheets before each chapter also allow you to navigate within the document. This document also contains an "Index" section. You may search the document for the indexed words by clicking on the desired page number. This will take you to the page that contains the word or subject.

The Final Environment Statement is available as a PDF (portable document format) file for viewing online. Viewing and/or printing a PDF file requires Adobe Acrobat Reader, a free program available for downloading.

Available Files: Post Indefinitely
Last Updated: 3/1/22