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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />1:- <br />I- <br />I"", <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4.0 Lake Catamount Dam <br /> <br />. <br />~, <br />1; <br />;: <br />!,: <br /> <br />Lake Catamount dam is a 57 foot high zoned <br />earthfill embankment constructed on the Yampa River in <br />Routt County in 1978. It is located in the NW1/4 of <br />Section 27, T4N, R84W, 6th Principal Meridian, about <br />6.8 miles downstream of Stagecoach dam and about 10.5 <br />miles upstream of Steamboat Springs. <br /> <br />, <br /> <br />(. <br />, <br /> <br />" <br /> <br />It has a normal operating capacity of 7,422 acre- <br />feet and a normal surface area of 563 acres. There is <br />15 feet of freeboard between the main ogee and <br />auxilIary roller gate channel spillways, elevation <br />6900, and the top of the dam. The roller gate has <br />never been installed and flow through the roller gate <br />channel is controlled by inserting steel stop logs. <br /> <br />The discharge capacity of the ogee spillway is <br />26,000 cfs with the water at the top of the dam. The <br />discharge capacity of the auxilIary roller gate channel <br />spillway is 4,900 cfs with the water at the top of the <br />dam and the elevation of the top of the stop logs at <br />6900 feet. <br /> <br />~ <br />~',~ <br /> <br />The <br />long. <br />on the <br />on the <br /> <br />crest of the dam is 20 feet wide by 400 <br />The embankments slope 3 horizontal to 1 <br />upstream side and 2 1/2 horizontal to 1 <br />downstream side. <br /> <br />feet <br />vertical <br />vertical <br /> <br />Lake Catamount dam <br />overtopping by the dam <br />,Stagecoach reservoir. <br />be used: <br /> <br />will be assumed to fail due to <br />failure flood coming from <br />The following assumptions will <br /> <br />Water level - <br /> <br />at the crest of the dam, <br />elevation 6915 <br /> <br />Surface Area - <br /> <br />983 acres <br /> <br />Reservoir Volume <br /> <br />normal operation capacity <br />plus freeboard storage, or <br /> <br />18900 acre-feet <br /> <br />Time of breach - <br /> <br />to be determined <br /> <br />The slope of the Yampa River channel downstream <br />from Lake Catamount dam varies from about 22 feet per <br />mile immediately below the dam to about 10 feet per <br />mile at Craig. A Manning's roughness coefficient of <br />0.40 was assumed for all reaches downstream of <br />Catamount dam. <br /> <br />to <br />