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<br />. <br /> <br />4.201 <br /> <br />of the conduit which cross well-developed drainages. The <br />forebay will be in a natural depression occurring atop a <br />ridge. The pumped-storage powerplant is located on the south <br />slope of this ridge. <br /> <br />Twin Lakes Dam and Reservoir. will be situated in the glaciated <br />U-shaped Lake Creek Valley. The darn will be constructed on a <br />terminal moraine which represents. one of the glacier's last <br />advances. The reservoir will be contained within moraines, <br />glacial outwash, and the glacially reworked Dry Union <br />formation. <br /> <br />The Otero Canal will cross glacial moraines and the Dry Union <br />formation and will have a short tunnel through an outlying <br />granite knob. The Otero Powerplant will be constructed on <br />another granite knob (roche moutonnee) which is mostly <br />blanketed by a lateral moraine. Clear Creek Darn and <br />Reservoir, which will be rehabilitated, is situated in the <br />glaciated U-shaped valley of Clear Creek. <br /> <br />. <br /> <br />The Mt. Elbert-Malta Transmission Line will be located along <br />the eastern limit of the valley and w111 be constructed on <br />the Dry Union Formation, glacial moraines, and stream <br />alluvium. The alluvium will be encountered along the <br />Arkansas River Channel and in crossing the major side drain- <br />ages of the Arkansas River. <br /> <br />The Fountain Valley Conduit will pass to the east of the <br />crystalline-sedimentary contact with the sedimentary forma- <br />tions dipping slightly to the east. When the conduit <br />approaches the physiographic contact, steeply dipping beds <br />'Will be encountered. The conduit will hQl ('onEtructeJ .Ln <br />sauJ~lunes, shales, and unc.onsolidated combinations of clay, <br />silt, sand, and gravel. <br /> <br />Pueblo Dam and Reservoir are located on the western edge of <br />the Great Plains about 20 miles east of the physiographic <br />contact. The area is one of nearly horizontal beds of <br />Cretaceous-aged shales, limestones, and sandstone with the <br />reservoir being contained within these formations. The <br />dam is located on the slightly domed center of a north-south <br />trending anticline with a maximum dip of 5 degrees. The <br />base of the dam sets on the Dakota sandstone with the abut- <br />ments keyed into the Graneros Shale and Greenhorn Limestone. <br /> <br />. <br /> <br />IIl-14 <br />