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<br />. <br /> <br />Woodward.Clyde Consultants <br /> <br />0983 <br /> <br />~ <br /> <br />I <br /> <br />reservoir capacity, operation and overall designs for the <br /> <br /> <br />spillways and outlet works structures and economic and <br /> <br /> <br />environmental factors. <br /> <br /> <br />Our work also included the review of three separate <br /> <br /> <br />reports written by Thomas M. Leps, George F. Sowers and Howard <br /> <br /> <br />A. Coombs who constituted an independent panel assembled by the <br /> <br /> <br />Bureau for a similar evaluation of the safety of the dam and <br /> <br /> <br />its foundation. Any significant differences in our <br /> <br /> <br />recommendations and conclusions from those of the Bureau <br /> <br /> <br />consultants are covered by our narrative discussions in this <br /> <br /> <br />report. <br /> <br /> <br />3. General Description of the Dam and Site <br /> <br /> <br />The Narrows dam site as shown on Figure 1 is located on <br /> <br /> <br />the South Platte River upstream approximately 7 miles from the <br /> <br /> <br />city of Ft. Morgan in Morgan County, Colorado. A zoned earth <br /> <br /> <br />dam as shown by the Bureau's feasibility design drawing <br /> <br /> <br />553-0-24, Figures 3 and 4, is planned. The maximum section has <br /> <br /> <br />an approximate height of 147 feet above streambed to the crest <br /> <br /> <br />elevation of 4454.0 feet. The total crest length is about <br /> <br /> <br />22,500 feet which includes a considerable length of low <br /> <br /> <br />abutment dikes for flood storage purposes. <br /> <br /> <br />The dam site is located on a portion of the South Platte <br /> <br /> <br />River where the present river channel is several miles north of <br /> <br /> <br />an old deep channel now filled with alluvium. The bedrock at <br /> <br /> <br />the site is the pierre formation consisting of shaley siltstone <br /> <br />>> <br /> <br />- 4 - <br /> <br />(I <br />