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,- C' 4", '.) 0 SUMMARY . Twin lakes Reservoir would inundate parts of T. 11 S., Rs. 80 and 81 W., lake County, Colo. As proposed the new dam would'be approximately t mile east of the present Twin Lakes Dam or outlet control structure. The high-water l1ne would be rais'ed from its present elevation of 9,192 feet to 9,256 feet. Although a few gold lode and placer claims have been patented in and near the reservoir limits, there is no evidence of recent mining activity and no indication that any mineral production of consequence was ever made. The Twin Lakes now are used for water sports and water storage. Some cattle are grazed on the adjacent valley floor and hillsides. INTRODUCTION At the request of the Bureau of Reclamation, Region 7, penver, Colo., a reconnaissance has been made of mineral resources in the Twin Lakes Reservoir site and nearby surrounding area. Study of the Twin Lakes site, a feature of the authorized Fryingpan-Arkansas Project, was completed during September and October 1963. Mineral resources were appraised by examining all published data, including those of the Bureau of Mines, Bureau of Reclamation, Federal Geological Survey, and Colorado Scientific Society; by studying records of the Bureau of Land Management and Lake County Assessor; by question- ing local residents; and by personal reconnaissance of the area. . LOCATION AND PHYSICAL FEATURES The Twin Lakes Damsite on Lake Creek, a tributary of the Arkansas qiver, is in sec. 23, T. 11 S., R. 80 W., Lake County, Colo. (fig, 1). The proposed reservoir would flood parts of sees. l~ through 23, and 30, T. 11 S., R. 80 W., and sees. 2~ and 25, T. 11 S., R. 81 W. The dam '"ould be placed across the outlet of the lower of the existing, natural Twin Lakes about t mile east of the present shoreline, further enlarging capacity. In the past, an outlet was dredged below the lake surface elevation of 9,192 feet, fitted with a discharge control system, and, in this way, 5~,862 acre-feet of live storage was developed (fig. 2). The damsite is reached, frClll Leadville, Colo., the nearest town, by traveling 16 miles south on U. S. Highway 24 to its Junction with Colorado 82: Turn west on 82 for 1.4 miles. At approximately this point (fig. 3), the axis of the proposed dam would cross the highway. . XI-22