The investigation includes: A determination of the extent, types and major sources of pollution; A review of existing laws and pending legislation regarding pollution of public waters in the States of Wyoming, Nebraska, and Colorado; An evaluation of the sanitary quality of irrigation water at present and proposed impoundments, diversion points, and in existing canals; A recommendation regarding minimum stream flows below the reservoirs for public water supplies and for sanitation purposes with present and contemplated pollution; An evaluation of the sanitary quality of water for municipal requirements and other public uses; An estimate of possible benefits to abatement of water pollution problems by reservoir releases; Recommendations and existing plans for pollution abatement.