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<br />, <br />, ! <br /> <br />--' <br /> <br />, I <br /> <br />(65,000 af). This estimated demand projection has factored in extensive non- <br />structural and conservation measures. <br /> <br />HiQhwav Relocations - Development of a reservoir in Clear Creek Canyon would <br />require relocation of u.s. Highway 6. Relocation would also be required of <br />Highway 119. As an example, one of the six highway relocation alternatives is <br />shown in Figure 1.1. All six highway relocation alternatives would continue to <br />provide direct access through the canyon from Golden to Central City for tourism <br />and for canyon recreation. Implementation of this project would require the <br />resolution of significant issues involving the Colorado Department of Highways <br />and the users of Highway 6 in Clear Creek Canyon. These issues include: the <br />impacts of the project on the highway users and on regional access, highway safety <br />for existing and proposed conditions; and the governmental processes required for <br />relocation of U.S. Highway 6. Based on these preliminary studies, average user <br />costs (based on driving time, mileage and accidents) are expected to increase by <br />about ten percent. All six of the roadway relocation alternatives are projected <br />to increase safety for traffic currently using U.S. Highway 6. <br /> <br />--' <br /> <br />Dam location and Size - A large dam in Clear Creek Canyon is required to <br />meet the water supply goals of the project (to develop at least 35,000 af of <br />native Clear Creek water). This will require a reservoir with a capacity of <br />175,000 to 230,000 af. Respective dam heights would range from 490 to 540 ft. <br />Clear Creek Canyon is the only suitable location within the drainage basin that <br />could provide the required storage capacity. <br /> <br />Suitability of Canyon for Construction of Dam and Reservoir - Preliminary <br />geological and engineering studies indicate that suitable dam and reservoir sites <br />exist within the canyon. Initial studies indicate that a concrete-arch dam would <br />be the dam type best suited to these site conditions because of the competency <br />of dam foundation rock, availability of construction material for production of <br />concrete, and the damsite topography. Preliminary investigations indicate that <br />the Black Hawk Fault and the terrace gravels identified within the Centennial <br />reservoir would not be a seepage path for migration of water from the reservoir. <br />Initial geologic findings are based on interpretation of published data and must <br />be confirmed by deta"iled field investigation. <br /> <br />6-2 <br />