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<br />. <br /> <br />. <br /> <br />. <br /> <br />. I....... . <br />'i:"iD '..; <br /> <br />(13) Heavy timber cutting occurred in the early 1900's <br />during the settlement of the area. Vegetation cleared at <br />the Mt. Elbert Powerplant site was sparse second growth <br />consisting of coniferous trees, grasses, forbs and brush. <br /> <br />(14) The recreation use o,f Twin Lakes Reservoir is not <br />expected to be impaired by the powerplant with the exception <br />of ice fishing. Fluctuating the water level on a daily <br />basis may cause an irregular thickness of ice establishment <br />on the lake in the tailrace area and a weakening of the ice <br />in peripheral areas of the lake. Ice fishermen access may <br />be limited. In the interim period when the powerplant is <br />operated without the Mt. Elbert Conduit, the Twin Lakes <br />water levels will fluctuate about 1.0 foot daily with only <br />one pump turbine in operation. <br /> <br />(15) Hydroelectric power generated by Mt. Elbert Pumped- <br />Storage Powerplant will complement the base load energy <br />by providing peaking power during periods of daily heavy <br />power demands. The primary advantage of the hydroelectric <br />power capability is its efficiency-of-response to heavy <br />power demands. Fossil fuel plants are not efficient for <br />this type of operation. Hydroelectric power can begin and <br />cease at the throw of a swi~ch which allows water to flow <br />through the turbines. <br /> <br />However, the pumping back of water to the forebay consumes <br />fossil fuel energy which partially offsets the benefits of <br />hydroelectric peaking power. <br /> <br />7. Twin Lakes and Mt. Elbert Forebay <br /> <br />COMPONENTS <br /> <br />Twin Lakes Dam <br /> <br />Misc. Power and Telephone <br />Line Relocations <br />Recreation Plan <br />Perry Peak Riprap Source <br />Dike <br />Intake Structure and Channel <br /> <br />Twin Lakes <br />Mt. Elbert Forebay Dam <br />Mt. Elbert Forebay <br />State Highway 82 Relocation <br />County Road l4 Relocation and <br />Improvements <br /> <br />a. Cumulative Impacts of the Components <br /> <br />(1) The construction of a new and enlarged Twin Lakes Dam <br />and Reservoir will have a more predominant visual effect on <br /> <br />IV-70 <br />