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<br />. <br /> <br />current year. The water quality data for the period January 1941 <br />~ <br />01 through December 1963 were adjusted by correlation with the samples <br />~ <br />~ taken by The Metropolitan Water District of Southern California at <br />,. <br /> <br />the Lake Havasu Intake Pumping Plant. <br /> <br />Colorado River at Imperial Dam, Arizona-California. The stream- <br /> <br />I. <br /> <br />flow data for this station were obtained from a combination of several <br /> <br />. <br /> <br />stations. Data from January 1941 through September 1942 are from <br /> <br /> <br />the Colorado River near Picacho, California, gaging station; data <br /> <br /> <br />from October 1942 through September 1960 are based on the combined <br /> <br />. <br /> <br />discharges at gaging stations on the Colorado River at Yuma, A11- <br /> <br /> <br />American Canal near Imperial Dam, Gila Gravity Main Canal at Imperial <br /> <br /> <br />Dam, Yuma Main Canal at Laguna Dam, and North Gila Valley Canal at <br /> <br />. <br /> <br />Laguna Dam less the Gila River near Dome, Arizona. Data after <br />September 1960 are based on the combined daily discharge of the Colorado <br />River below Imperial Dam, the All-American Canal near Imperial Dam, <br />and the Gila Gravity Main Canal at Imperial Dam. <br /> <br />. <br /> <br />Water quality data from 1943 through October 1970 were obtained <br />from Geological Survey records based on data for the Yuma Main Canal <br />below the Colorado River Siphon. Water quality data following <br />October 1970 were obtained from Geological Survey records taken <br />at Imperial Dam. <br /> <br />. <br /> <br />Present and Historical Salinity Levels and Salt Loads <br /> <br /> <br />Historical annual streamflow and quality of water data for <br /> <br />the Colorado River near Cisco, Utah; the Green River near Green <br />· River, Utah; the San Rafael River near Green River, Utah; the San <br />Juan River near Bluff, Utah; and the Colorado River at Lee's Ferry, <br /> <br />. <br /> <br />-22- <br /> <br />. <br />