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-4- Periodic trips were made to the selected station sites and samples were taken as follows: Aquatic invertebrate samples were taken by using the Surber Square Foat Sampler; zooplankton samples were taken with the Wiscon- sin Plankton Sampler; ten liters ware concentrated to form the zooplankton samples; algal samples were taken at random within the study area; and phytoplankton was collected by scraping material from the bottom of the stream and by use of a modified diatometer. This diatometer was constructed to accept microscope slides as a sub-surface collecting strata. All flora and fauna samples collected were preserved with 107, formalin for future identification. Marginal and streamside vegetation and aquatic plants were pressed and mounted. The majority of plant identification was made by Dr. Seville Flowers of the Department of Botany at the University of Utah. All water chemistry obtained at the sampling stations was conducted according to standard methods. Dissolved oxygen, pH, MO and phth alkalinity, phosphates and nitrites were run on the samples as soon as possible. Other analyses were run as soon as convenient. Additional water chemistry data and turbidities was obtained from a "Trona" processing plant .operated by the Intermountain Chemical Company. This plant operates a pumping station, far processing water, approximately three miles below station three of this report. Coliform counts were made by diluting samples when necessary and making a p1_ate count after incubation. The media used was violet red bile agar. Turbidities were taken with a Jackson turbidometer. Determination of the spawning potential and resident status of sport fish was made by analyses of fish composition data and by conducting hatch- ing experiments within the study area. Hatching experiments were conducted to determine the viability of brown trout, rainbow trout and kokanee salmon in the Green River proper. Mapping was accomplished by use of UoS.G.S. contour maps, information from the Bureau of Reclamation and assistance from the Engineering Division of the Wyoming Game and Fish Department. All water flow data was secured from the U. S.G.S. office in Casper, Wyoming, and from "Surface Water Supply of the United States", a publication of the U. S. G. S. STATION LOCATIONS The following is a listing of the sampling sites established on the Green. River within the study area of this project. The name of the nearest well known landmark or object has been assigned to these stations to help in establishing definite location.