The objectives of this survey were to determination of the extent, types, and major sources of pollution in the basin, review existing state laws in Colorado, Wyoming, and Nebraska and pending legislation regarding pollution of public waters, determination of the sanitary quality of water for irrigation uses at present and at proposed diversion points and in existing canals, minimum stream flows necessary below the reservoirs for public water supplies and for sanitation purposes with present and contemplated pollution loads, public water supply needs, possible benefits to the abatement of water pollution problems by reservoir releases, and recommendations and existing plans for pollution abatement.