AZ vs. CA:17 California Exhibits, Vol. XVII; Nos. 2701-2724; 2800; 2901-2905; 3001-3050

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ing in 1925. Since that time the program has been expanded to include many of the major points of water interest along the main stem and tributaries. Table II has been prepared to show the available records at those stations which are used in this report. Since 1940, and including some years prior to 1930, the quality of water records have been published as Water Supply Papers of the Geological Survey. A large part of the data, particularly during the 1930-1940 period, is unpublished. These unpublished records have beeen generously supplied to the writer by the Washington Office of the Survey. After examination of the records, it was decided that this report should cover the period from 1929 to 1951, the data since 1951 bein.o- generally unavailable for analysis. For this 23-year period, the data on both quantity and quality are either available at the several river stations used or can be supplied by correlation methods with reasonable accuracy, sufficient for the conclusions drawn by the report. Summary tables showing the total quantities of dissolved solids and the quantities of the several constituents are included herein. TABLE II AVAILABLE QUALITY OF WATER DATA AT SOME COLORADO RIVER STATIONS Climatic Year Values Reported* Where Found** Colorado River at Cisco 1929 Complete U.S.G.S. Unpublished Data 1930 Complete W. S. Paper 1931-1935 Complete U.S.G.S. Unpublished Data 1936-1940 T.D.S. U.S.G.S. Unpublished Data 1941-1943 T.D.S. W. S. Papers 1944-1951 Complete W. S. Papers Green River at Greenriver, Utah 1929 Complete U.S.G.S. Unpublished Data 1930 Complete W. S. Paper 1931-1935 Complete U.S.G.S. Unpublished Data 1936-1940 T.D.S. U.S.G.S. Unpublished Data 1941-1943 T.D.S. W. S. Papers 1944-1951 Complete W. S. Papers San Juan River at Bluff 1930 Complete W. S. Paper 1931-1940 Complete U.S.G.S. Unpublished Data 1941-1951 Complete W. S. Papers -30-