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<br />.. <br /> <br />'II <br /> <br />:0 <br />" <br /> <br /> <br />November 2, 1998 <br /> <br />I1J.~C~1 <br />11/011 ~ "~l> <br />Coc;olor~", 0 ~9p <br />$&% ....,,~ u <br />~Cl? tt;e,. <br /><lr(/ <br /> <br />h <br /> <br />City of Denver <br />Department of Natural Resources <br />Executive Director James Lochhead <br />Rm 718 <br />Denver, CO 80203 <br /> <br />Natural Resource Information for the <br />Cherry Creek Environmental Impact Statement <br />Cherry Creek Dam Safety Project, Colorado <br />Proiect No. 98-802-4-007 USODCOE <br /> <br />Dear Mr. Lochhead: <br /> <br />Burns & McDonnell is preparing an Environmental Impa<et Statement (EIS) for the <br />proposed Cherry Creek Dam Safety Study, as a third party contractor to the U.S. <br />Army Corps of Engineers, Omaha District. <br /> <br />Cherry Creek Dam is located on Cherry Creek. The outlet works are located <br />upstream of the confluence of Cherry Creek and the South Platte River, 11.4 miles <br />southeast of downtown Denver. The existing spillway hydraulically connects the <br />Cherry Creek Basin with the adjacent Toll Gate Creek and Sand Creek Basins. <br />Cherry Creek Dam controls surface water runoff from 385 square miles of the 410 <br />square mile Cherry Creek Basin. The mouth of Cherry Creek, at its junction with the <br />South Platte River, is located in the heart of the business district of Denver. <br /> <br />At this time, we have completed the preliminary screening of the proposed <br />alternatives. Three primary construction alternatives and a no-action alternative have <br />been recommended for a more detailed analysis. These three alternatives are <br />designed to correct the hydrological deficiency for Cherry Creek Dam by providing <br />increased flood storage capacity or increasing emergency spillway capacity, or a <br />combination of the two. <br /> <br />One of these alternatives includes the construction of an upstream dry dam (see map <br />included). The dry dam alternative was initially expected to be eliminated during <br />preliminary investigations however, preliminary plan formulation now indicates that <br />this alternative merits detailed evaluation. This increases the potential for a dry dam <br />to possibly develop into a component of the preferred alternative. <br /> <br />ENGINEERS. ARCHITECTS. CONSULTANTS <br />9400 Ward Parkway <br />II Kansas City, Missouri 64114.3319 <br />.. Te/:816333-9400 <br />Fax: 816 333-3690 <br />hllp:! /www.burnsmcd.com <br />