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<br /> <br />. <br /> <br /> ~umber <br />~ 1 <br />1~ 2 <br />0 3 <br />r ' <br /> 4 <br /> 5 <br /> 6 <br /> 7 <br /> 8 <br /> 9 <br />. <br /> <br />. <br /> <br />FIGURES <br /> <br />Quality of water map. Colorado River Basin. . . . <br />Flow and quality of water records, 1941-74. . . . <br />Weighted average dissolved-solids concentrations, <br />Colorado River below lees Ferry. Arizona. . . <br />Investigation and construction schedule, Colo- <br />rado River Water Quality Improvement Program. <br />Colorado River at Lees Ferry--sediment and water- <br /> <br />flow. . . . . . . . . . . . . . . . . . <br />Combined Colorado River near Cisco, Green River <br />at Green River, Utah, and San Juan River near <br />Bluff . . . . . . . . . . . . . . . <br />Annual maximum. minimum. and weighted average <br />concentration of dissolved solids of Green <br />River near Greendale 1958-1975. <br />Mean monthly temperature of Green River near <br />Greendale . . . . . . . . . . . . . . . . . <br />Salinity changes in Lake Powell at Wahweap site <br /> <br />viii <br /> <br />Page <br />Frontispiece <br />37 <br /> <br />42 <br /> <br />101 <br /> <br />111 <br /> <br />112 <br /> <br />115 <br /> <br />116 <br />118 <br /> <br />