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ALTERNATIVE 2 UPSTREAM MAINSTEM STORAGE The upper mainstem storage site con- sidered in this alternative is the Two Forks Reservoir, located just down- stream from the confluence of the North Fork of the South Platte River and the mains tern South Platte River near the town of South Platte, The total capacity of the proposed Two Forks Reservoir is 975,000 acre-feet. which includes flood control. sedi- ment. water supply and surcharge storage. This storage capacity would provide an average deliverable water supply of 30,800 acre,feet. Evaluation The market-valued outputs of this alternative would be municipal and industrial water supply and hydroe. lectric power. Net annual economic benelits are estimated to be $7,0 mil- lion, This amounts to slightly greater than 1.4 percent rate of return on the estimated required investment of $492 million in construction costs, -~ . An estimated 66 residences within the area would need to be relocated due to construction 01 the project. The community of Buffalo Creek could change from a low-density recrea- tional area to a high. density recrea- tional center with commercial uses. There would probably be a subse- quent increase in need for govern- ment and services. Inflow into the proposed upstream mainstem reservoir would contain rel- atively small dissolved solids concen- trations. The construction and operation of an upstream reservoir would result in the inundation of about 6,500 acres 01 wildlife habitat, The inundated reach would also change the river lishery to a lake fishery, The average hydroelectric capacity at the proposed Two Forks project would be 76 megawatts in winter and 77 megawatts in summer. '0 :..p-t ~ <I')., "t, if ~--C, >- "f""'r (,..- . '. '.:..1/ P' ,~_ \",\ ~ "~ ~ ~ ,. I / I <\ ~~ . ~: ~I K~I (2) 1.\.;' ~\ , ' i.,) :+;.. · , *fJ '<~' C' -S> " (t-- .~ " ~ ,- J f , I ( , " / , ,1 ,. I -, -- \ L_ 4 CHEE,MAN LAKE 6'" .-....-__.