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<br />FRYING PAN-ARKANSAS PROJECT, COLORADO
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<br />for the sharing of joint water obligatiolIs of the four States, The
<br />upper Colorado R,iver compact was signed Octobe.r: 11, 1948, subse-
<br />quently ratified by the upper basin States and approved by the Con-
<br />gress, Full consummation of the apportioned uses of Colol'lldo River
<br />water in the upper basin States, consistent with the rights and obliga-
<br />tions of the compacts and the Mexican Treaty of 1945, would require
<br />construction of major regulatory reservoirs in the upper basin.
<br />41. Western slope feature.s,-A system consisting of about 50 miles
<br />of canals and tunnels would enable the collection of water from Hunter
<br />Creek and the Fryingpan River-both tributaries of ,the Roaring
<br />Fork River, The water so collected would be diverted to the eastern
<br />slope through the potential Fryingpan-Arkansas Tunnel, about 6 miles
<br />in length. Since 19:35, the Twin Lakes Reservoir & Canal Co, has
<br />diverted western slope water from the Roaring Fork drainage to its
<br />reservoir on the eastern slope. The 'company has a legal right to'
<br />divert more water than it has diverted to date; but such increased
<br />diversions would be detrimental to fishery values in the Roaring Fork
<br />River ,and its tributaries above Aspen, In order to preserve those
<br />fishery values the project plan includes a.n extension of the collection
<br />system to the South Fork of Hunter Creek and enlargement of other
<br />project facilities to permit an exchange of water with the Twin Lakes
<br />Co, This plan hinges upon the execution of agreements whereby the
<br />company would refl'llin from certain diversions through its own system
<br />whenever the natural flow of the Roaring Fork River falls below a
<br />specified minimum in exchange for an equivalent supply delivered on
<br />the eastern slope through project facilities, The cost of these specific
<br />facilities and enlargements is estimated at $2,179,000 and is considered
<br />economically justifia,ble by the Fish and Wildlife Service on the basis
<br />of resul ting benefits,
<br />42, The Aspen Reservoir would be constructed near the town of
<br />Aspen to provide replacement water and also to provide water for
<br />future use in meeting demands in western Colorado, The reservoir,
<br />which would inundate about 650 acres /tnd have an active capacity of
<br />28,000 acre-feet, would be created by an earth-fill dam about 90 feet
<br />in hAight, A short supply callal would divert water from Hunter
<br />Creek to the reservoir,
<br />43, The Aspen Dam site is at an altitude of 8,017 feet. The
<br />collection system for the transmountain diversion would be entirely
<br />above 10,000 feet altitude, The chief construction problems will be
<br />the short working season and transportation of materials,
<br />44, The west,ern slope features would enable the average annual
<br />diversion of an estimated 69,200 acre-feet of project water. As a
<br />result of eastern slope storage to be provided by the project, about
<br />14,900 acre-feet, of water could also be diverted annually by the Twin
<br />Lakes Co" which cannot now be diverted for lack of storage capacity.
<br />This would 'be in addition to its present average diversion of 38,000
<br />acre-feet,
<br />45, Eastern slope supply and power features,-In round figures, the
<br />major potential eastern slope project facilities include three earth-fill
<br />darns, 60 miles of power canal ranging in capacity from 300 to 1,000
<br />second-feet, three diversion darns, over 10 miles of diversion canals,
<br />seven hydro-electric power plants and switchyards, three small fore-
<br />bays and two afterbays, nine substations, about 400 miles of trans-
<br />mission line, and a municipal water supply system, The latter system
<br />inCludes one diversion dam, 15 miles of reservoir supply canal.for irri-
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