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<br />Introduction <br /> <br />The operation of the Colorado River Basin during the past <br />year and the projected operation for the current year reflect <br />flood control, river regulation, beneficial consumptive uses, <br />hydroelectric power generation, water quality control, <br />enhancement of fish and wildlife. recreation, and Colorado <br />River Compact requirements. <br /> <br />Storage and release of water from the Upper Basin reservoirs <br />arc governed by all applicable laws and agreements <br />concerning the Colorado River, including the impoundment <br />and release of water in the V pper Basin required by Section <br />602(a) of the Colorado Riwr Basin Project Act of September <br />30, 196& (Public Law 90-537). The operation of the Lower <br />Basin resec'VOirs reflects Mexican Treaty obligations and <br />Lower Basin contractual commitments. <br /> <br />Nothing in this report is intended to interpret the provisions <br />of the Colorado Riwr Compact (45 Stat. 1057), the Vppcr <br />ColoradoRiwr Basin Compact (63 Stat. 3!),the Water Treaty <br />of]944 with the United Mexican Slates (Trcaly Series 994, 59 <br />Stat. 1219), the United StatesjMexico agreement in Minute <br />No.2420fAugust 30,1973,(TreatySeries 770&;24U ST 196&), <br />the Decree entered by the Supreme Court of the United States <br />in Arizona v. California et al. (376 V.S. 340), the Boulder <br />Canyon Project Act (45 Stat. 1057), the Boulder Canyon <br />Project Adjustment Act (54 Stat. 774; 43 V.S.C. 6l8a), the <br />Colorado Riwr Storage Project Act (70 Stat. 105; 43 V.S.C. <br />620), the Colorado Riwr Basin Project Act (&2 Stai. 885; 43 <br />V.S.C. ISO!), the Colorado Riwr Salinity Conlrol Act (8& <br />Stat. 266; 43 U .S.C. 1951), or the Hoover Power Plant Act of <br />1984 (9& Slat. 1333). <br /> <br />Authority for Report <br /> <br />Pursuant to the Colorado River Basin Project Act (Public <br />Law 90,537) of 1968, I am pleased to present to the Congress, <br />and to the Governors of the Colorado River Basin States, the <br />twenty-first annual report on the Operation of the <br />Colorado Rher Basin. <br /> <br />This report describes the actual operation of the reservoirs in <br />the Colorado River drainage area constructed under the <br />authority of the Colorado River Storage Project Act, the <br />Boulder Canyon Project Act, and the Boulder Canyon Project <br />Adjustment Act during water year 1991, and the projected <br />operation of these reservoirs during water year 1992, under <br />the "Criteria for Coordinated Long-Range Operation of <br />Colorado Riwr Reservoirs," (Operating Criteria) published <br />in the Federal Ree-;ster June 10,1970. <br /> <br />The Operating Criteria and Section 602 of Public Law 90-537 <br />mandate consultation with representatives of the Governors <br />of the seven Basin States and the Upper Colorado River <br />Commission relative to annual plans for operation of the <br />Colorado Riwr reservoirs. The 199] Annual Operating Plan <br />(AOP) was prepared by the Bureau of Reclamation in <br />consultation with the GO\oernors' representatives of the seven <br />Basin States, the Upper Colorado River Commission, (lnd <br />others. <br /> <br />Manuel Lujan, Jr., Secretary <br />Vnilcd Slates Departmenl of the Interior <br /> <br />I <br />