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Sanitary Aspects of Watershed Management As overall watershed management involves many interests, it is considered essential that proposed developments and activities on watersheds pertaining to public health aspects be fully coordinated with State and/or local health departments. These matters should be mutually considered prior to the actual develop- ment of the watershed and issuance of permits. Adequate and safe water and sanitary waste disposal facilities, in accordance with State and/or local health agency standards, shou14 be provided in public use areas to serve camping, picnicking, ~nd other recreational uses. Water and sanitary facilities for pri- vate dwelling sites should also meet the established health standards. The effectiveness of the sanitation program should be evaluated periodically by a detailed sanitary survey in conjunction with laboratory analyses of water samples collected from surface and/or ground water in the watershed. On reservoirs constructed primarily to serve as a source for a municipal water supply, extreme caution should be exercised in considering recreational use of the reservoir. This also involves the possibility of additional pollution entering the water supply and the matter of aesthetics. Preliminary Vector Evaluation Anticipated Effects of the Proposed Project on Vector Problems Mosquitoes are the principal vectors which might be affected by the proposed project, although other insects and rodents may be involved. Several species of mosquitoes of public health importance including Culex tarsalis, the encephalitis mosquito, and the vicious- biting Aedes dorsalis are produced in large numbers in the area when suitable aquatic habitats are present. Basic information concerning pertinent biological characteristics of these mosquitoes is given in Appendix A. Encephalitis, commonly known as sleeping sickness, or brain fever, is now the most important mosquito-borne disease in the United States and the area in which the proposed project is located. Records of the U. S. Department of Agriculture show that equine encephalitis cases occurred in the general project area (Ouray County and/or adjoining counties) during nine years of the l7-year period, 1939 through 1955, for which records are available. Although no outbreaks of en- cephalitis in humans have been reported from the area of the proposed project, the reported equine encephalitis cases indicate that viruses 39