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of the disease are active in the area. Additional information concerning the public health and socio-economic importance of mos- quito and other vector problems associated with water resource developments is presented in Appendix B. During the field r~connaissances of the project area in June and July 1961, and July 1962, extremely prolific production of mosquitoes was found in meadowlands and roadside ditches in the vicinity of Ridgway. Impoundment of the proposed Ridgway Reservoir would inundate and permanently eliminate these important sources of mosquitoes. Portions of the ~idgway, Sneva, and Dallas Divide Reservoirs that have shorelines with little or no vegetation and are exposed to wave action will be unfavorable for the production of mosquitoes and other aquatic insects of public health importance and will require no special vector prevention or control measures. Mosquito production may occur in tributary embayments and other marginal areas of the reservoirs where the topography is flat and the water is shallow, protected from wave action, and contains ' emergent vegetation or flotage. Information concerning reservoir preparation, maintenance, and water level management in relation to mosquito prevention and control is presented in Appendix C. . The development, of water-related recreational and other public use areas in conjunction with the proposed reservoirs may result in the exposure to humans to vectors of terrestrial origin, including arthropods such as ticks, fleas, and flies, and rodents such as ground squirrels, chipmunks, and mice. In order to minimize public health hazards at waterside recreational areas, appropriate prevention and control measures for both aquatic' and terrestrial vectors should be carried out. Observations during the field surveys of the project area showed numerous existing mosquito sources ,in the presently irrigated sections resulting from inadequate drainage facilities and seeped or waterlogged lands in the valley areas. It is anticipated, there- fore, that provision of a larger supply of water for lands presently irrigated and the development of additional new irrigated areas may aggravate existing mosquito sources and create new aquatic habitats favorable for mosquito production unless ,appropriate prevention and control measures are provided and continued as a part of the regular operation and maintenance. Pertinent information concerning the relationships between irrigation and mosquito sources is presented in Appendix D. . By making provisions for the prevention and control of man- made vector sources, the overall benefits of the project can be greatly increased. 40