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<br /> <br />._ _ ,~~, ~' ('t <br />i",~ "';t~\,) <br />.. ... <br /> <br />. <br /> <br />PLAN OF DEVELOPMENJ; <br /> <br />Description <br /> <br />The Ruedi Dam-and Reservoir will be located on the F'ryingpan <br />River, a tributary of the Roaring Fork River which enters the Colorado <br />River at Glenwood Springs, Colorado. The damsite is about 14 miles <br />east of Basalt, Colorado and about a quarter of a mile below the con- <br />fluence of Ruedi Creek with the Fryingpan River. The reservoir ~rlll <br />be a1::out 4~1/2 miles long Hith a maximum 'Nidth of about three-quarters <br />of a mile. Location of the dam and reservoir is shown on both <br />Exhibits" 1 and 2. <br /> <br />The dam will be an earthfill structure with crest elevation <br />of 7780 feet m.s.l. Crest length will I~ 1,0'0 feet and heights above <br />streambed and foundation will be 270 feet and 290 feet respectively. <br />A glory-hole type spillway with capacity of 9,250 cubic feet per second <br />will be provided, together with a tunnel outlet through the right abut- <br />ment of the dam. The reservoir outlet 11i11 be by tunnel throueh the <br />left abutment and will have a capacity of 1,000 c.f .s. With normal <br />storage capacity of 100,000 acre-feet, the water surface will cover an <br />area of about 1,000 acres at elevation 7764 ~et m.s.l. Engineering <br />details are shown on the Prelillli.nary Estimate Drawing, Exhibit 3. <br />Designs are subject to modification as additional information becomes <br />~ available. <br /> <br />Geology <br /> <br />Preliminary geologic investigations in the dam and reservoir <br />area were made in 1946 and 1948. The Fryingpan River, in flowing west- <br />ward to meet the Roaring Fork River, crosses a series of formations of <br />Paleozoic age. The damsite occupies a narrow gorge cut into red colored <br />sandstones and shales, the upper part of the Maroon formation of <br />Pennsylvanian age. These massive strata dip steeply downstream due to <br />faulting and folding in the local area. The entire Naroon formation as <br />exposed in the vicinity appears to be about 2,,00 feet thick, with some <br />1,000 feet of upper red sandstones underlain by 1,000 feet of alternat- <br />ing buff colored siltstones and limestones, in turn resting on a bed of <br />gypsum e:x;ceeding ,00 feet in thickness. The r.egional structure is that <br />of a plunging anticline, the river cutting a steep ca~on across the <br />upper red sandstone hogbaCk, with the basal gypsum being exposed in the <br />reservoir or central anticlinal area near Ruedi. The gypsum bed <br />necessarily underlies the dam at a depth of about 1,000 feet. The <br /> <br />. <br /> <br />14 <br /> <br />