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3.3 <br />The Ruedi Dam and Reservoir is a major structural feature of the Fryingpan- <br />Arkansas Project. The dam site is located 14 miles east of the town of Basalt <br />in Pitkin and Eagle Counties and within the White River National Forest. The <br />reservoir has an active conservation capacity of 102,369 AF at elevation 7,766.0 <br />feet. Surface area of the reservoir is 997 acres at elevation 7,766.0 feet. <br />Table 3.1 gives capacity and surface area data for Ruedi Reservoir at selected <br />elevations. <br />Ruedi Reservoir provides for replacement of water diverted from the Western <br />Slope to the Eastern Slope and an additional regulated water supply for other <br />uses on the Western Slope. Maximum storage provided for replacement under the <br />present operational conditions is 28,000 AF. Average annual replacement storage <br />under the present operational conditions is estimated at 1,100 AF based on <br />operational simulation for a period of record from 1948 to 1983. The maximum <br />replacement during this period of record is estimated at 6,100 AF during an <br />extremely dry year (1981). The remainder of the conservation storage volume in <br />excess of 28,000 AF is available for other uses. <br />Ruedi Dam is constructed of earth and includes a spillway, outlet works, <br />auxiliary outlet works, and Rocky Fork Creek bypass. The dam is 285 feet high <br />above the streambed, 30 feet wide at the crest, and 1,042 feet long. The <br />concrete spillway capacity at maximum water-surface elevation 7,781.8 is 5,540 <br />cfs. The outlet works are located through the rock formation under the right <br />abutment of the dam at the bottom of the conservation pool (see Table 3.1). The <br />main outlet work capacity at reservoir level 7,766 is 1,000 cfs. The auxiliary <br />outlet works have a capacity of 600 cfs at reservoir level 7,766. The Rocky Fork <br />Creek bypass consists of an earth dike and a 25-foot wide concrete overchute <br />across the spillway stilling basin. The bypass has a capacity of 4,000 cfs. <br />The Fryingpan River below Ruedi Dam is a cobble- and boulder-bed channel <br />typical of high mountain streams in the Rocky Mountains. The average gradient <br />of the river from Ruedi Dam to its confluence with the Roaring Fork River at <br />Basalt is 69 feet per mile. Near Castleview Ranch the gradient of the Fryingpan <br />flattens to 32 feet per mile and the river adopts a slightly meandering form. <br />The general form of the Fryingpan River is controlled by the steep walls of the <br />canyon and the river is essentially restricted from any lateral movement. <br />Average width of the river is approximately 100 feet with steep boulder banks. <br />Because of the large size of the bed and bank materials that form the Fryingpan <br />River, the channel is very stable. The interstitial areas in the channel bed