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<br /> <br />2 <br /> <br />We understand that your Bureau is preparing a brief report supple- <br />ment primarily dealing with the economics of the Narrows Unit. 'Our <br />report supplement also presents a brief revised summary of project <br />economics related to fish and wi ldl ife. This summary presents costs <br />and benefits, based on current 1969 price levels, to replace those <br />shown in the synoptic portion of our report dated August 4, 1966. <br /> <br />New Proposal--State-Managed Fish Hatchery Unit <br /> <br />Our earlier report did not request a State fish hatchery and rear- <br />ing unit downstream of Narrows Dam since this plan had not yet been <br />formulated. To help establish and maintain both coldwater and warm- <br />water fish species and to more nearly realize the full potential of <br />the fishery in Narrows Reservoi r and associ ated waters, th is fish <br />production unit would prove extremely valuable as an integral part <br />of the p roj ect. <br /> <br />Analysis of the operational data for Narrows Reservoir indicates <br />that its average size would be about 10,000 acres. In view of the <br />fluctuations anticipated and the heavy fishing use forecast for <br />the reservoir, natural reproduction would not sustain the desired <br />catch per man-hour of fishing. Project plans include the retention <br />of Jackson Lake for fish and wildlife and recreation. The lake <br />would be stabi I ized at about 2,100 surface acres. In addition to <br />these requirements, fish stocking would be needed to realize the <br />potential of the tailwater fishery of the South Platte River down- <br />stream of Narrows Dam. <br /> <br />The Colorado Division of Game, Fish and Parks estimates that to <br />establ ish an adequate walleye fishery in Narrows Reservoi rand <br />maintain the existing fishery in Jackson Lake, a minimum of <br />56,000,000 walleye fry would need to be stocked for the first three <br />years after filling. To maintain the walleye fishery in Narrows <br />Reservoir and Jackson Lake, a minimum of 36,000,000 walleye fry <br />would need to be stocked annually. In addition, about 5 million <br />northern pike, 250,000 largemouth bass, 100,000 smallmouth bass, <br />and one million channel catfish would be stocked to maintain the <br />reservoirs and downstream fishery. About 200,000 channel catfish <br />of 8- to l2-inch size and suitable numbers of catchable-sized rain- <br />bow trout also would be stocked annually. Crappies and bluegills <br />would be stocked in sufficient numbers to establish and maintain <br />populations. <br /> <br />The State owns and operates two warmwater fish production units <br />which are inadequate to supply the stocking needs for more than <br /> <br />- <br />