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(':;'l BASIC STUDIES W W ~~ (Table No. 12). Load data for these years were estimated by extensive multiple correlations using data for the Colorado River near Cisco, Utah, and near Grand Canyon, Arizona; the Green River at Green River, Utah; and the San Juan River near Bluff, Utah. Colorado River near Grand Canyon, Arizona Discharge measurements are available for the period of study and chem- ical quality records are available except for the period December 1942 to August 1943 (Table No. 13). Loads for the period of missing records were estimated from records at upstream stations. Virgin River at Littlefield, Arizona Discharge measurements were obtained for the study period but quality data are available only from July 1949 to December 1964. Detailed corre- lations were employed to estimate the data for the missing period (Table No. 14). Colorado River below Hoover Dam, Arizona-Nevada Discharge and quality records are available for the 1941-64 period (Table No. 15) to present, except for the period November 1944 to Septem- ber 1950 when these quality data are based on specific conductance analy- ses only for intermittent intervals (Table No. 15). Colorado River below Parker Dam, Arizona-California Discharge measurements for the study period are included in records of the Geological Survey. Quality data have been obtained since July 1941 by the Metropolitan Water District of Southern California at the Lake Havasu Intake Pumping Plant and are published in its Report No. 815 dated November 1963 for the July 1941 through September 1963 period. The six months of missing rec,rd were obtained by correlation. Monthly re- cords of the chemical analyses of constituents for July 1941 through De- cember 1964 were obtained from the Metropolitan Water District of South- ern California (Table No. 16). Colorado River at Imperial Dam, Arizona-California Discharge figures are available for the study period. Those from October 1942 through Septemember 1960 are based on the combined records of discharge obtained at gaging stations on Colorado River at Yuma, All- American Canal near Imperial Dam, Gila Gravity Main Canal at Imperial Dam, Yuma Main Canal at Laguna Dam, and North Gila Valley Canal at Laguna Dam less that of Gila River near Dome, Arizona. Records after September 1960 are based on the combined daily discharge of Colorado River passing Imperial Dam and at gaging stations on All-American Canal near Imperial Dam and Gila Gravity Main Canal at Imperial Dam. 22