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309G . Bureau of Outdoor Recreation The Bureau requested further discussion of the impacts of (1) mudflat exposure, (2) water fluctuation, (3) prevailing winds, (4) recreation experience, and (5) insect breeding effects upon recreationists. Each catagory is discussed individually in the following text, (1) Mudflat exposure: The distance between the water and the developed public use areas is not expected to be an inconven- ience to recreationists. Most of the proposed water oriented recreation developments will be located in areas with favorable topographic conditions. Such conditions will permit convenient water access and will minimize adverse effects of fluctuating water levels, Access facilities will be paved or gravelled. Area of excessively steep and gradual topography which hinder convenient recreation access will not be developed into intensive use areas. However, in upper reaches of the reservoir designated for wildlife management where bottomland exposure will be most extreme, there will be limited vehicular and/or trail access to the water. This access development will be coordinated with the Colorado Game, Fish and Parks Department and the Bureau of Sport Fisheries and Wildlife, The mudflats should not be a burden to fishermen, boaters and water skiers after the recreation areas are developed and they have hard surface access to the water, . (2) Water fluctuation: The inundated rock material in the area of the dam and reservoir consists of Cretaceous aged sandstone, shale and limestone. Although the Bureau questions the feasibility of maintaining "high quality" beaches during fluctuation, the sandy material in the overburden may provide a "desirable" beach when erosion occurs according to Reclamation geologists. Suspended silt material 'nIl be deposited on sand beaches during drawndown periods. The silt originating from resistant rock material above the reservoir, will be minimal and any deposits on beach areas will probably be removed by wave action. In intensive developed recreation areas, sanitary and other boating service facilities will be designed to float on the water and provide convenient access at any water Level. Lesser developed recreation areas will have facilities such as sealed- vault and skid-mounted chemical toilets, During periods of high water, the vaults will be sealed and the portable toilets moved. Floating docking facilities will be installed in intensive use recreation areas which have favorable topography conducive to easy access at most water levels. Some adjacent 62 .