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To: All Annual Operating Plan Recipients From: Lower Colorado Region River Operations Group Attention: BC004600 P.O. Box 61470 Boulder City, NV 89006-1470 Phone: 702-293-8190 This operation study reflects the 2003 Annual Operating Plan (AOP) as signed by the Secretary of Interior. This study shows that the normal determination is the criterion governing the operation of Lake Mead for calendar year 2003. A copy of the 2003 AOP, as submitted to the Secretary for approval, can be obtained by contacting Lorraine Siano, (702)293-8539 or visit our website at www.lc.usbr.gov/lcrivops.html. e Due to the non-execution of the Quantification Settlement Agreement, calendar year 2003 and 2004 reflect normal schedules as defined by the Record of Decision, Colorado River Interim Surplus Guidelines Final Environmental Impact Statement. Calendar year 2003 reflects schedules based on the Preliminary Injunction dated March 18, 2003, granted by Judge Thomas J. Whelan, United States District Court, in the court case Imperial Irrigation District v. United States Government. Calendar year 2003 schedules are 0.592 million acre-feet (MAF) for the Metropolitan Water District of Southern California, 1.635 MAF for the Central Arizona Project, and 0.280 MAF for southern Nevada pumping from Lake Mead. The total Lower Basin scheduled consumptive use for calendar year 2003 is 7.5 MAF. This study shows California at 4.4 MAF, Arizona at 2.8 MAF and Nevada at 0.3 MAF. As of 6/10/03, due to the current elevation of Lake Mead, Hoover's generating plant effective capacity has been changed to 1840 MW. Unit capacity tests will be performed as lake elevation decreases in 2' increments. Davis generating plant effective capacity has changed to 255 MW. This study reflects these changes in the projections. Current runoff projections into Lake Powell are provided by the National Weather Service, Colorado Basin River Forecast Center and are as follows: observed unregulated inflow into Lake Powell for the month of May was 1.156 MAF or 50\ of the 30 year average. The forecast for the month of June unregulated inflow into Lake Powell is 1.800 MAF or 58\ of the 30 year average. The projected April through July unregulated inflow for water year 2003 is 4.0 MAF or 50% of average. Projected water year 2003 unregulated inflow into Lake Powell is 6.596 MAF or 55% of average. e Hoover, Davis, and Parker historical gross energy figures come from form PO&M from the Power and O&M Group, Boulder Canyon Operations, Bureau of Reclamation, Boulder City, Nevada. Questions regarding these historical numbers can be directed to Joe Donnelly, (702)293-8607. (Note: lower basin previous months historical SNWS and flow to Mexico values are preliminary estimates.)