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On~1 .~,~ The Narrows Unit will be a multipurpose development which will furnish supplemental water and provide flood control, recreation. and fish and wildlife development. Potential future municipal and industrial water could also be furnished. storage water would be released as necessary from the reservoir to supplement irrigation within the 166.370-acre service area of the Lower South Platte Water Conservancy District. and. through exchange, 120,700 acres in the Central Colorado Water Con- servancy District. The project would make available. on the average. 140.700 acre-feet of water annually. including 21.300 acre-feet of divertible return flow to supplement irrigation requirements on the acreages indicated above. The Narrows unit would reduce irrigation water shortages in both of the aforementioned water districts. Appli- cation of this supplemental water supply would produce net irrigation benefits totaling $4.113.500 annually. The Narrows Reservoir will provide a major flood control facility for that area of the state below the reservoir to the state line. The Corps of Engineers has evaluated the flood control benefits to be derived from the construction and operation of the Narrows Dam and Reservoir. These benefits would total $800.000 per year. The project would also provide major fish and wildlife and recreational benefits. The reservoir will be the largest ever constructed in the state and will contain a permanent pool of approximately 50.000 acre-feet. The Narrows Reservoir and Jackson Lake will provide a major warm-water fishery. The fish and wildlife and recreational benefits were evaluated by the U. S. Fish and wild- life Service and the National Park Service and annually would total $828.300 and $2.296.000. respectively. Based on July 1975 prices. the estimated project cost, of the Narrows unit totals $139.025.000. Annual costs. including equivalent of investment and operation, maintenance and replacement costs. would total $5.458.100. Total annual benefits would amount to $8.038.700. resulting in a benefit-cost ratio of 1.5:1. The total right-of-way requirement for the proposed development will include 2.350 acres of Federal land and approxi- mately 42.465 acres to be acquired in fee title. Present land use within the proposed right-of-way boundary includes about 33 percent irrigated cropland. 38 percent pasture. 3 percent dry cropland and other drylands. 25 percent river bottom lands. and 1 percent river channels. -2-