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<br />....:. ;_.... {"' <br />.j.~ 'U ..:- <br /> <br />. <br /> <br />BASALT PROJECT <br /> <br />PROJECT PLAN, FEATURES, AND COSTS <br /> <br />along the condu:Lt. cutoff collars would be constructed around. the conduit <br />at 20-foot intervals. Slide gates located in a gate chamber would be <br />utilized to control releases from the reservoir. Access to the gate <br />chamber would be provided by a vertical shaft constructed over the cham- <br />ber and connected to the dam crest by means of a steel "alkway. No <br />spillway would be required as the flow to the reservoir >Jould be largely <br />regulated by releases from the Ruedi Reservoir and diversions from Cattle <br />Creek through the Mountain Meadow Canal. The natural drainage area above <br />the Missouri Heights Dam is only about 4 square miles with a maximum <br />probable annual runoff of about 3.000 acre-feet. If necessary. this <br />amount of water could be stored by utilizing a portion of the 10 feet of <br />freeboard planned for the dam. <br /> <br />The water surface of the enlarged reservoir would cover an additional <br />450 acres of privately owned agricultural and grazing lands. Trees and <br />brush in the reservoir basin would be removed as required. No improvements <br />of consequence are on lands required for the enlargement. <br /> <br />. <br /> <br />Reconnaissance geological investigations have indicated that it <br />would be practicable to raise the existing dam. A red sandstone, kn~,n <br />as Maroon formation of Permian age. is the bedrock at the damsite. The <br />depth of bedrock at the dam site is unknown. The existing dam appears <br />to be stable. although some seepage losses do occur. The seepage should <br />be further investigated when detailed studies are made. <br /> <br />Materials for the enlarged dam. except free drainage gravels. are <br />available in the immediate vicinity of the dam. Gravels for use as con- <br />crete aggregate. construction of drains. and bedding for riprap could be <br />obtained from the Roaring Fork River channel about 10 miles south of the <br />dam site. <br /> <br />Basalt Conduit <br /> <br />The Basalt Conduit. with a capacity of 100 second-feet. ~ould head <br />at the outlet works of the Ruedi Dam and meander west>Jard along the <br />southern slope of the Fryingpan Hi ver Canyon for approximately 10 miles <br />to a point where it would cross by siphon to the north side of the river. <br />Here the conduit would break out of the steep canyon into undulating <br />bench lands over which it would continue northwest for approximately 12 <br />miles to its terminus at the Missouri Heights Reservoir. The conduit's <br />total length of' about 22 miles would include 9.6 miles of open earth <br />section. 10.5 miles of bench flume or conduit, and 1.9 miles of siphons. <br /> <br />. <br /> <br />The canyon section traversed by the conduit is generally rough with <br />steep sand$tone ledges covered in most places with talus accumulations <br />mixed with.residual soils. Most cross slopes in this section range from <br />40 to 70 percent. Brush, aspen, and coniferous timber occupy much of the <br />canyon alie!nment and would have to be cleared. The conduit in this section <br />would consist largely of lined canal. bench flume. or closed conduit. <br /> <br />14 <br /> <br />