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" t-, ,- - J. " ...: u Operating statistics of the river for the water year 1972-73 are presented in Tables 1 through 6. These follow with accompanying discussions. . TABLE 1 HEASURED FLOIl IN COLORADO RIVER AND TRIBUTARIES FOR \lATER YEAR 1972-73 (Thousands of Acre-Feet) Station Heasured Flow Upper Basin Green River at Green River, Utah Colorado River near Cisco, Utah San Juan River near Bluff, Utah Colorado River at Lee Ferry 5,438 6,560 3,017 10,123 Lower Basin - Colorado River Near Grand Canyon Below Davis Dam Below Parker Dam At Northerly International Boundary above I.lorelos Dam 11,152 7,%6 6,651 1,250* *For Calendar Year 1973, the flow at the Northerly International Boundary ''las 1, 231,000 acre-feet and was part of the 191.:-1:- r.iexican \later Treaty minimum obligation of 1,500,000 acre-feet annually. Additional deliveries to f1exico during the 1973 Calendar Year included 120,000 acre-feet delivered at the Southerly International Boundary near San Luis, 9,400 acre-feet delivered to the City of Tijuana through facilities in the United States, and 215,000.acre-feet of irrigation drainage waters of the \lellton-Hohawk Irrigation and Drainage District discharged belov; Borelos Dam, for a total delivery of 1,625,000 acre-feet. Table 1 shows the measured flow at key stations. The first three stations listed in Table 1 represent over 90 percent of the flov; into Lake Pov1811. As has been the case for a number of years, flows below Davis Dam were limited to meeting the consumptive use requirements of the United States and the r-lexican \later Treaty delivery requirements. Table 2 shows changes in storage for the basin reservoirs in water year 1972-73. Overall, the total storage increased by 7,936,000 acre-feet during the year. ,. - 2 -