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PART I. INTRODUCTION The Quality of water, Progress Report, No. 13 (Progress Report) was prepared by the U.S. Bureau of Reclamation (Reclamation) of the Department of the Interior (DOl), in cooperation with the U.S. Department of Agriculture (USDA), other agencies of the Department of the Interior including the U.S. Geological Survey (USGS) and the Bureau of Land Management (BLM); the Environmental Protection Agency (EPA); and the Colorado River Basin States of Arizona, California, Colorado, Nevadar New Mexico, utah, and Wyoming. This Progress Report is the latest in a series of 13 biennial reports beginning in 1963. Part I covers the authorization and legal aspects of this report. Part II gives a brief decription of the colorado River Basin, the subject of this report. part III summarizes several perspectives by the Basin States and Federal Government on the water quality in the Basin. Part IV reviews the causes and effects of the most significant problem in the basin, salinity. Part V looks at the salinity problem in more depth, discussing many of the factors which affect salinity. Part VI details present and future developments which will affect salinity in Basin. Part VII summarizes details of the Colorado River Salinity Control Program which is meant to offset the effects of development and preserve the resource for irrigation, municipal, industrial, and other uses. Part VIII summarizes the results of the Colorado River Simulation System (CRSS) salinity projections. The projections start at present conditions in 1986 and predict flow and salinity through the year 2010. Finally, Part IX summarizes water quality studies which are relevant to the purpose of this report. A. Authorization for Report This is the 13th biennial progress report on quality of water in the Colorado River Basin. The directive for preparing this report is contained in four separate public laws--Public Law 84-4aS, Public Law 87-483, Public Law 87-590, and Public Law 93-320. Public Law 84-485 states: "The Secretary of the Interior is directed to continue studies and make a report to the Congress and to the States of the Colorado River Basin on the quality of water of the Colorado River. It Public Law 87-483 states: liThe Secretary of the Interior is directed to continue his studies of the quality of water of the Colorado River system, to appraise its suitability for municipal, domestic, and industrial use and for irrigation in the various areas in the united States in which it is used or proposed to be used, to estimate the effect of additional developments involving its storage and use (whether heretofore authorized or contemplated for authorization) on the remaining water available for use in the United States, to study all possible means of improving the quality of such water and of alleviating the ili 1-1