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<br />INTRODUCTION <br /> <br />o <br />tA.) <br />...... <br />\'\) <br /> <br />B. Previous Reports <br /> <br />The January 1963 report prepared by the Department of the Interior <br />was comprised of two parts: (1) An assessment of the water-quality sit- <br />uation in the part of the Colorado River Basin above Lee Ferry, Arizona, <br />as of 1957, prepared by the Geological Survey; and (2) A projection of <br />the water-quality effects to be expected from additional developments <br />that involve storage and irrigation use of river waters above Lee Ferry <br />by the Bureau of Reclamation. <br /> <br />The January 1965 report appraised water quality conditions in the <br />entire basin using the period 1941-61 as a base and including records <br />for two sites not considered in the January 1963 report. Projection of <br />the effects of developments on water quality were extended to Imperial <br />Dam in the January 1965 report. <br /> <br />Because the suppLy of the previous progress reports has been ex- <br />hausted and in order to keep each report self-contained, it has been nec- <br />essary to include some of the text material and tables from these previous <br />reports in this third progress report dated January 1967. <br /> <br />C. Cooperation <br /> <br />This report has been prepared chiefly by the Bureau of Reclamation. <br />The Geological Survey provided most of the basic data, prepared the sec- <br />tions of "basic studies" on Flaming Gorge Reservoir and the lower Colo- <br />rado River, and reviewed the technical aspects of the report. A contin- <br />uing cooperative program between the Bureau of Reclamation and the Survey <br />for the collection of streamflow and quality data and the exchange of in- <br />formation has been in effect for a number of years. This cooperation <br />provides for the collection of data at stations other than those normalLy <br />maintained by the Survey in order to obtain additional data at key points <br />in the basin. Data collected by the Metropolitan Water District of South- <br />ern California have also been included in this report. <br /> <br />Below Hoover Dam, water quality along the main stem of the river is <br />determined by anaLyzing daiLy samples taken at key stations operated by <br />the Bureau of Reclamation in cooperation with the Geological Survey. <br />Data obtained above each project diversion and below the return flow <br />from each project show the effect of irrigation on water quality in each <br />section of the river. Data are obtained periodically at various points <br />along the river and in drains in cooperation with the U.S. Geological <br />Survey, the Colorado River Indian Agency, the Metropolitan Water District <br />of Los Angeles, the Imperial Irrigation District, and others. <br /> <br />D. Scope <br /> <br />This report includes information on the quality of water in the <br />Colorado River Basin down to Imperial Dam for the 1941-64 period. The <br /> <br />3 <br /> <br />