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<br />SYNOPSIS <br /> <br />ANNUAL OPERATING PLAN--WESTERN DIVISION <br />MISSOURI RIVER BASIN <br />1965 OPERATIONS <br />1966 OUTLOOK <br /> <br />GENERAL <br /> <br />This is the fourteenth Annual Operating Plan for the system, which <br />consists of Federally owned dams, reservoirs, canals, tunnels, pumping <br />plants, hydroelectric powerp1ants, electric transmission lines, <br />substations, and other facilities. Most of these features are <br />located in the North and South Platte River Basins in Colorado, <br />Wyoming, and Nebraska, and in the Big Horn Basin in Wyoming. Some <br />features of the Colorado-Big Thompson Project are located in the <br />Colorado River Basin and Arkansas River Basin in Colorado. <br /> <br />The report has two main parts. One part is historical and reports the <br />results of actual operations for the 1965 water year, which extended <br />from October 1964 through September 1965. The other part presents <br />operation plans for water year 1966. <br /> <br />Proposed operation for domestic use, irrigation, hydroelectric power <br />generation, fish and wildlife preservation, pollution abatement, and <br />other collateral purposes is based on three conditions of water supply: <br />(1) a reasonable maximum, (2) a reasonable minimum, and (3) the most <br />probable. Supplemental irrigation requirements are also estimated <br />for these conditions of inflow on the Colorado-Big Thompson Project. <br />The plan is modified as necessary in accord with changing conditions. <br /> <br />1965 OPERATIONS <br /> <br />Inflow to Western Division reservoirs during water year, 1965 was much <br />above normal. During the first 6 months of the water year, October <br />through March, runoff was below normal varying between 67 percent at <br />Lake Estes to 93 percent at Green Mountain Reservoir. Reservoir <br />inflow during the April-July period ranged from 134 percent of <br />normal at Seminoe Reservoir to 280 percent of normal from the North <br />Platte tributaries between Alcova and Guernsey Reservoirs. July <br />inflows to several reservoirs were exceptionally high. Boysen <br />ReserVoir received the greatest July inflow since construction. <br />Runoff originating above Lake Estes, Lake Granby, Willow Creek, and <br />Green Mountain Reservoirs during July was the second highest of record <br />and was exceeded only by July 1957. However, the total runoff during <br /> <br />i <br />