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<br />Final Draft - Preferred Storage Options Plan <br />Southeastern Colorado Water Conservancy District <br />June 8, 2000 <br /> <br />to accept sustained flows during periods when stored return flows are exchanged for <br />water diverted higher in the Basin. Pertinent data are summarized below. <br /> <br /> Storage Volume <br /> 10,000 at 30,000 at 51,000 at <br />Dam Crest Elevation 5468 5497 5510 <br />Normal Maximum Pool Elevation 5458 5487 5500 <br />Nominal Dam Height, (ft) 50 79 110 <br /> <br />Storage capacity is limited to site topography and exchange potential. Currently, CSU <br />believes that 15,000 af of storage will be required at Williams Creek to meet its water <br />management objectives. Therefore, only the 30,000 and 51,000 af options provide <br />potential to meet the objectives of other water users who might want to partner in <br />development of the project. Storage potentials in Williams Creek for District participants <br />other than CSU would be 15,000 af (for the 30,000 af option) and 36,000 af (for the <br />51,000 af option). CH2M Hill concluded that constructing a dam at the Williams Creek <br />site to the heights outlined previously would be technically feasible. <br /> <br />Environmental and Permitting Issues. Williams Creek Reservoir construction will need <br />to address species of concern (mountain plover and prairie dog) and wetland impacts <br />(about 12 acres for a 15,000 afreservoir). These impacts likely can be mitigated and the <br />needed authorizations gained to construct the project. <br /> <br />An EA or EIS will be required. The most likely lead federal.~ency would be the Corps <br />of Engineers. <br /> <br />Implementation Cost. Williams Creek Dam and Reservoir would have total <br />implementation cost ranging from $25.5 to $98.2 million, as summarized below: <br /> <br />J:\PROJECfS\9906IIReportsIPrefem:d SOP Final wpd <br /> <br />3-15 <br /> <br />m GEl Consultants, Inc. <br />