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. . . . Est imated Costs The cost estimate for the Narrows Unit was based on the feasibility design as presented in the 1976 Adden~um. The plan was repriced and indexed to January 1981 price levels. The reduced project cost is 'shown on the following tabulation: ' JUly 1975 ($1,000) As . Januar~ 1981 DPR addendum authorlzed Wlthout flood control Narrows Dam and Reservoir $126,745 $278,529 $241,029 Recreation development 4,175 8,957 8,957 Fish and wildlife Enh ancement 1,585 2,598 2,598 Mitigation 6,520 10,090 10,090 Tot a 1 proj ect cost $139,025 $300,17411 $262,674 11 The total project cost of $300,174,000 exceeds the adjusted project cost ceiling by $39.3 million which is less than the contingencies included in the project cost estimate. , Other Considerat50ns Potential. Hydroelectric Powerplant A 2.3 mega\~att hydroelectric power fadility was estimated to.utilize river releases averagin9 750 ft3/s ih June, July, and AU9ust, and 150 ft3/s during the remainder of the year. 1 The cost estimate for the potential powerplant was based on appraisal level cost curves developed by Tudor! Engineering Company, Denver, Co 1 orado, under contract with the Bureau of Rec 1 amat i on. The cost for mod i fying the river out 1 et works was added, and the powerp 1 ant cas ts were indexed to January 1981 price 1 eve,] s. The cost of constructing a 2.3-megawatt powerplant at Narrows i Dam would be approximately $6.9 million including indirect costs a~d interest during construction. Fish and Wildlife and Recreation The fish and wildl ife enhancement and: recreation purposes were not modified for this evaluation from those reported in the 1976 Addendum. Facilities \~ould be developed to enhance fish and wildlife potential at Jackson Lake Reservoir and below NarliOWS Dam. A fish hatchery at Narrows Reservoir has also been propqsed to enhance the reservoir fishery. ' 4