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The focus of the EIS is to evaluate alternative operations of the dam. In addition, other mitigation measures may be identified to minimize impacts to resources of concern. Alternative dam operations and potential structural and institutional mitigation measures will be considered to formulate the range of reasonable alternatives. Alternative dam operations may result in off-site cumulative impacts. Given the best available information, the magnitude of these impacts will be identified so that the Secretary of the Interior is informed of the consequences and options available to address these issues. Ten preliminary alternatives were formulated as a result of the March - May 1990 EIS scoping process and scientific data. These preliminary alternatives were presented to the public in a March 1991 newsletter distributed to over 20,000 entities and at public meetings conducted in April ofl991 in Flagstaff, Arizona; Phoenix, Arizona; and Salt Lake City, Utah. Using the comments received from the 456 letters on the preliminary alternatives and additional scientific research data, seven alternatives were selected for detailed analysis in the EIS. Evaluation of these alternatives wil1 include additional elements that may be added to any alternative. These elements include: Sand pumping, beach protec- tion, beach/habitat building flows, reduced flood frequency, multi-level intake structure and power system adjustments. The EIS team wil1 be performing impact analysis and writing the EIS in 1992. b. Recreational Use The extensive recreational use of Glen eanyon National Recreation Area, which surrounds Lake Powel1, is demonstrated by the fact that for the first 11 months of 1991, 3,132,448 people visited the area. The National Park Service has concession-operated facilities at Wahweap, Dangling Rope, Halls erossing, Hite and Bullfrog Basin on the reservoir and Lees Ferry, 16 miles below the dam on the eolorado River. The San Juan Marina, which was operated on Lake Powel1 by the Navajo Nation, is now closed due to a flood in 1989. From 1909 through 1961, an estimated total of20,972 people visited Rainbow Bridge. When access to the bridge by water was made available through completion of the dam in 1963, visitation rapidly increased. In 1966,20,468 people visited Rainbow Bridge, almost as many people as had visited the site during the previous 53 years. Through November of 35