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. . . o en w CO SPECIAL STUDIES (Continued) A more recent report funded by the Bureau of Reclamation entitled "A Mathematical Model of Primary Productivity and Limnological Patterns in Lake Mead, Technical Report No. 13." September 1972 analyzes the biological and chemical properties of Lake Mead based on eight sampling stations. This report indicates the sources of water pollution and the time of highest pollution potential. It also presents a method of quantifying eutrophication trends in Lake Mead. Another report entitled "Final Report on Interrelationships between Chemial, Physical, and Biological Conditions of the Waters at Las Vegas Bay at Lake Mead" by Dr. James Deacon, University of Nevada, Las Vegas, May 1973, describes the effects of Las Vegas Wash, an enriched stream on Lake Mead. The Biology Department of the Uni versi ty of Nevada, Las Vegas, conducted a special study called the "Lake Mead Water Quality Monitoring Program." A report on this program was issued in April 1975. Complete chemical and nutrient analyses are made for water samples taken by the Bureau of Reclamation quarterly at three stations in Lake Mead: Hoover Dam Intake Towers, Saddle Island Station, and Station 10. The California Department of Fish and Game just completed a limno- logical study of the Lower Colorado River from Needles California to the Northerly International Boundary. The report was completed in 1978. The University of Nevada at Las Vegas will be completing a two-year limnological study on Lake Mead in December of 1978. The report in- cludes information on the nutrient problems which will probably be associated with the Hoover Modification program. The report will be available in early 1979. E. Upper Colorado River Salinity Investigations Water quality samples are being collected daily, monthly, or quar- terly from approximately 100 sites on the rivers, canals, drains, and sloughs by the Bureau of Reclamation and by the Geological Survey for the Bureau of Reclamation in the Upper Colorado River Basin. This pro- gram is in addition to the regular Geological Survey network. Samples are collected at various locations for the purpose of evaluating effects of future water resource projects on the river system, identifying sources of salinity for water quality improvement projects, obtaining basic data for research projects, and acquiring long-term records to determine trends and observe overall changes in the salinity of the river system. This monitoring system will be especially valuable in providing data for the "Colorado River Water Quality Improvement Pro- gram" in the basin. 119