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PUBLIC HEALTH SERVICE The National Park Service studies of the Dolores project area indi- cate the most d.esirable recreational areas that may ultimately be devel- oped by Federal, State. local, or private interests. The availability of suitable sites on the McPhee Reservoir shoreline is limited by the precipitous shorelines and the fluctuating water level. Fluctuation of the water level tends to limit recreational development to the lower portion of the reservoir. Two sites on the shoreline of the McPhee Res- ervoir are suitable for marina developments. Other sites on adjacent mesas are satisfactory for recreation use. Potential recreation devel- opment for the other reservoirs in the potential Dolores project are indicated in the National Perk Service studies. vTater and sanitary facilities for the various recreation areas have been inclUded. The extent of recreational development contiguous to the reser- voirs will be regulated somewhat by the topographical features of the reservoir area. A receding shoreline during the irrigation season. together with mud and silt deposits accumulated on the shoreline during high ,rater level in the reservoirs. will create hazards and undesirable conditions so as to deter some water.based recreational activities. The problem of providing adequate and safe sanitary facilities for the public at potential recreational areas is essential in eliminating public health hazards. These problems include a safe snd ample water supply, proper sewage and refuse disposal, insect and rodent control, certified sources of milk and milk products. and proper food handling facilities. The concessionaires that operate recreational areas should be required to adopt and enforce rules and safety regulations to cover swimming. water Skiing. and boating in the reser,oirs. As public water supplies will be obtained from McPhee and Monument Creek Reservoirs. all recreational activities should be prohibited within a 1.OOO-foot radius of the water-supply turnouts. This assumes that chemical coaV1lation, sedimentation, filtration, and disinfection will be required to produce a potable public water supply from the raw water in McPhee and Monument Creek Reservoirs. Additional safeguards should prohibit all recreational activities within a one-mile radius from the point of discharge for the Dolores sewage treatment plant effluent. Vector-borne Disease and Related Problems .", ~ The field reconnaissences of the project area in September 1959 and June 1960 were conducted to determine (1) kinds and relative abundance of mosquitoes and other vectors in the area; (2) existing sources of these vectors; (3) effect of the proposed project on vector problems; ~~d (4) measures which might be incorporated into the design. construction. and operation of the project to minimize vector prOduction. Mosquito Species in the Area Larval col1ections.--ln September 1959. the lnajor sources of mos- quitoes in the area were the marshy seeps that occur along the sides 129