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"~ -:: .~;i,;.:;,~: .-~t~;';i. .~.":,;."c:',;..~~:5,'",:~/~;;t',~:1~~.~~~~~:~ ll") 0' c,., C\l CHAPTER IV PLAN FORMULATION provide storage, and diversion dams would be constructed on both the North Fork and on the lower mains tern. The storage water and part of the direct flow water would be diverted from the North Fork by the North Fork Diversion Dam about 1/4 mile above the mouth of Fawn Creek and delivered to Lake Avery through the White River Feeder Conduit. It would convey water to the Yellow Jacket and Oak Ridge Conduits at a point in the Little Beaver Valley, as shown on the following map. When available, all project water for irrigation and for the coal industry would be supplied by direct flow through the conduit. At such times as water is available in North Fork beyond project requirements, releases from the conduit would be made for storage in Lake Avery. At times when the flow of North Fork is insufficient to meet project demands, water would be pumped by the Avery Pumping Plant from storage in Lake Avery up to the conduit. At the downstream portal of the White River Feeder Conduit, water would be supplied to the Yellow Jacket and Oak Ridge Conduits. The Yellow Jacket Conduit would flow generally northwest to supply water for irrigation in the Little Beaver area and for coal industry use. The Oak Ridge Conduit would flow more or less southwest to deliver water to the Josephine Basin Canal for irrigation service in the Flag Creek and Josephine Basin areas. Both conduits would provide a gravity pressure supply for sprinkler irrigation, but the Josephine Basin Canal would provide water only for surface application. Water for the coal industry would be supplied at a turnout from the Yellow Jacket Conduit near its Coal Creek crossing. Delivery of all coal industry water from the conduit to the site of use would be the responsibility of the water users. Water for oil shale development and related uses would be made " available downstream on the White River at a diversion dam near the mouth of Yellow Creek. This supply would come from natural streamflows to the extent they exceed those needed to provide minimum streamflows at the State line (as discussed in Chapter III). When natural flows are inadequate, storage releases would be made from Lake Avery to provide the supply for oil shale processing. Conveyance of this water to ?oints of use beyond the diversion dam, as well as any desired treatment, would be the responsibility of the users. Project features Thornburgh Reservoir Thornburgh Reservoir on Milk Creek would have a capacity of 36,000 acre-feet and a surface area of 840 acres at normal water surface e'.eva- tion 6,716 feet. About 30,000 acre-feet of the capacity would be active and 6,000 acre-feet dead and inactive. 4~