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. At the downstream tunnel pot tal of the W11ite River Feeder Conduit, water would be supplied to the Yellow Jacket and Oak Ridge Conduits to serve the Little Beaver service area. The conduits and their laterals would provide a gravity pressure supply for sprinkler irrigation. Water for the coal industry Mould be supplied at a turnout from the Yellow Jacket Conduit near Coal Creek. MuniCipal and domestic water would be available from the Yellow Jacket Conduit at a turnout at the initial end and at another turnout near Curtis Creek northeast of the town of Meeker. Water 'for oil shale development and related uses would be made available from White River near the mouth of Yellow Creek. This supply would come from natural streamflows to the extent they exceeded flows necessary to ensure downstream rights and fishery protection. Storage releases would be made from Sawmill Mountain Reservoir to provide the oil shale supply when natural flows were inadequate. A diversion dam and pumping system would be necessary, but their construction and operation would be the responsibility of the water user. Delivery and treatment of all industrial and municipal water would be the responsiblity of the users. A minimum of 2 cfs would be ,ll;:.I..I.VW ....<.tLJ\l:'l. UU..l.l. March 1980 Page 2 of 2 released to Big aeaver Creek to maintain fish hab- itat between the two reservoirs. Access easements for fishermen may be acquired along the North Fork. Land in the Oak Ridge area may be.acquired for management as a big game area to mitigate wildlife losses associated with pro- ject development and operation. Axial Reservoir, in the Milk Creek drainage, would be managed as a fishing lake. Recreational facilities would be provided at the Sawmill ~~untain Reservoir and at Thornburgh Reservoir. Facilities for the preserva- tion of the historic values of the ~~lk Creek Battle Site would be constructed at Thornburgh Reservoir. A major coal-mining development was constructed in 1977 in the Danforth Hills near Milk Creek. Since the energy companies have purchased much of the land to be irrigated by the project~ it is possible that the Milk Creek Unit would no longer be jus- tified for irrigation purposes. In that event, the unit would probably be dropped from the project or else be reassessed to include an increased munici- pal and industrial supply. MARCH 1980 STATISTICS . Water supply (acre-feet) Irrigation Milk Creek Segment White River Segment Subtotal Coal industry ~alk Creek Segment White River Segment Subtotal 8,500 17,900 26,400 5,000 30,000 35,000 60,000 5,000 126,400 2,250 1,690 3,940 6,550 1;450 8,000 , 11,940 36,000 55,000 60 300 Initial capacity (ds) \ 60 300 125 35 160 46 Oil shale industry Municipal and domestic Total Irrigation service area (acres) Milk Creek Segment Full service Supplemental service Subtotal White River Segment Full service Supplemental service Subtotal Total Project features Reservoirs (cap~city: acre-feet) Thornburgh Sa~ill Mountain Diversion darn (cap~city: cfs) Milk Creek . North Fork Conveyance system . Milk Creek Canal North Fork Feeder Conduit Yellow Jacket Conduit Oak Ridge Conduit Oak Ridge Tunnel "Length (miles) 12.0 8.5 15.0. 9.1 0.6 ~ Estimated costs (January 1976) Thornburgh Dam and Reservoir Sawmill Mountain Dam and Reservoir Milk Creek Diversion Dam Nortr. Fork Diversion Structure Milk Creek Canal North Fork Feeder Conduit Oak Ridge Tunnel Yellow Jacket Conduit Oak Ridge Conduit Laterals Drains Permanent operating facilities Land acquisition for wildlife Axial Reservoir Fishery Historical preservation Total construction cost Interest during construction (5 years at 6-1/8 percent) Project investment $9,140,000 26,600,000 600,000 420,000 3,17U,000 24,510,000 1,700,000 8,660,000 1,840,000 4,460,000 1,300,000 520,000 1,000,000 10,000 30,000 83,960,000 12,860,000 $96,820,000 Annual costs Annual equivalent cost Operation, maintenance, and replacement Stream depletion Annual cost Annual benefits Irrigation Municipal and industrial use Recreation Fish and wildlife Negative effects Total known benefits $5,945,000 133,800 255,600 $6,334,400 $1,603,000 7,947,000 Not determined Not determined -21,000 $9,529,000 Benefit-cost ratio 1.50:1