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C;J 0) ~ C\! I. INTRODUCTION Request and Authority The Bureau of Reclamation, Region 4, Department of the Interior, in a letter dated August 14, 1962, requested the Public Health Service, Department of Health, Education, and Welfare, to participate in the water quality control aspects of the Bureau's planning for the Yellow Jacket Project as set forth in the Federal Water Pollution Control Act, as amended (33 U.S.C. 466 et seq.) The water quality control activities formerly conducted by the Public Health Service have been transferred to the Federal Water Pollutic,n Control Administration by P. L. 89-234. Purpose and SC0~e General objectives of this study are to assess the probable effects of the proposed project on water quality in local streams and reservoirs; to ascertain the benefits or harm resulting from changes in water quality; to assess the suitability of the water fcr propused water uses; and to determine the need for and value of storage for regulation of stream- flow for the purpose of water quality control. The study covers Rio Blanco, Moffat, and Routt Counties in northwest Colorado. The need for streamflow regulation was studied not only for the present conditions, but also for anticipated future conditions to the year 2065. Since this study has been made in advance of any comprehensive study of the Colorado River Basin, the findings presented are preliminary and subject to revision upcn completion of ccmprehensive studies for water supply and water quality managem?nt in the Colorado River Basin. Acknowledgments The assistance and cooperation of many state and federal agencies and individuals are gratefully acknowledged by the Federal Water Pollution Control Administration. Particular appreciation is expressed to the following for data and information furnished by their staff members: U. S. Bureau of Reclamation, Region 4 Salt Lake City, Utah Project Office Grand Junction., CoLJrad(> Colorado State Department elf Public Health Denver, Colorado