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-3- OBJECTIVES (1) To determine the species composition in the Green River proper and in the tributaries within the study area. (2) To determine the water chemistry of the river and changes .that occur throughout the year. (3) To determine the types and volume of plankton development, aquatic invertebrates and algal growth existing in the Green River proper. (4) To determine if resident populations of sport fish can be established and maintained is the section of stream above the proposed impoundment area and the best species suited. (5) 1Kapping the f.mpoundment area on contour maps to determine areas of rough fish spawning, recreational development. (6) To determine the spawning potential of sport fish, both natural and artificial, in the Green Riuar proper and in the impoundment area. (7) To determine the species of sport fish best suited to conditions which will exist in the impoundment area. METHODS 0'F PROCEDURE In determining the fish composition, a number of collecting methods were used: Experimental gill nets 150 feet long with mesh sizes ranging from 1 x 1 inches to 2 1/4 x 2 1/4 inches, modified wide mouth fyke nets with 50 foot wings, and an emulsified rotenone fish toxicant were used. In addition to the above, three shockers, a 115 volt 60 amp. AC, a 230 volt 10.9 amp. DC, and a 115 volt 1.3 amp. AC were used as water and bottom conditions dictated. Travel on the river to points where fish collections were made was very difficult during periods of low water flow, and many of the areas were inaccessible to vehicle. Construction and use of an air-boat facilitated collections and explanation in these areas. This craft was made from a 16 foot Aero-craft alukninLm boat .fitted with a 65 horsepower Continental aircraft engine and protective screens. Guiding was accomplished by two aluminum fins 2° x 3 1/2° mounted at the rear of the craft. A pressure fuel systeu was constructed from a 15 gallon gasoline tank with a car tine pump to provide pressure. Photos of this craft have been included in the text. In determining the water chemistry, flora and fauna existing in the river seven sampling stations were established; Station Number One being located at the upper end of the study area, in the vicinity of LaBarge, Wyoming and Station Number Seven at the Wyoming-Utah .State line well within the impounded area.