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<br />-. I.,."" <br />10v.J <br /> <br />Article II(2) of the Criteria for Coordinated Long-Range Operation <br />of Colorado River Reservoirs, promulgated by the Secretary of Interior <br />in June 1970, states that when Lake Powell active storage is less than <br />Lake r.1ead active storage, then the objective shall be to maintain a <br />minimum release from Lake Powell of 8.2) million acre-feet for that <br />year. Lake Powell active storage \'ras less than Lake Head active storage <br />during the 1977-7S water year, and the flo\T at Lee Ferry, consisting of <br />L~ce Powell releases plus Pari a River inflows assumed to average 20,000 <br />acre-feet a year, conformed to the Operating Criteria by slightly <br />exceeding the specified release. <br /> <br />Operating statistics of the river for the water year 1977-78 are <br />presented in Tables 1 through 5. These folloHwith accompanying discussions. <br /> <br />Table 1 shows the measured flow at key stations. The first three <br />stations listed in Table 1 represent over 90 percent of the flow into <br />Lake Powell. As has been the case for a number of years, flows below <br />Davis Dam were limited to meeting the consumptive use requirements of <br />the United States and the Mexican l'Tater Treaty delivery requirements. <br /> <br />TABLE 1 <br /> <br />MEASURED FLOt! IN COLORADO RIVER AND <br />TRIBUTARIES FOR HATER YEAR 1977-7S <br />(Thousands of Acre-feet) <br /> <br />Station <br /> <br />r.1easured Flow <br /> <br />Upper Basin <br /> <br />Green River at Green River, Utah <br />Colorado River near Cisco, Utah <br />San Juan River near Bluff, Utah <br />Colorado River at Lee Ferry <br /> <br />),S42 <br />4,47S <br />921 <br />l'l,244 <br /> <br />Lower Basin - Colorado River <br /> <br />Near Grand Canyon <br /> <br />Belo\'/' Davis Dam <br /> <br />Below Parker Dam <br /> <br />At Northerly International Boundary <br />above norelos Dam <br /> <br />S,451 <br />7,997 <br />6,71S <br /> <br />1,460* <br /> <br />*Additional deliveries to I.~exico are made at the <br />Southerly International Boundary near San Luis, to the <br />City of Tijuana, and telo" Morelos Dam through the <br />IJe11ton-Itoha\'lk Outfall Drain. See page 5 for data on <br />deliveries to nexico <br /> <br />- 2 - <br />