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I I Ie I I I I I I Ie I I I I I I I Ie I . . LOCATION The Cone Reservoir is located in San Miguel County in southwestern The reservoir is located approximately ten miles south of Norwood, Colorado. Colorado. The project area is distant from major centers of trade. Montrose is located approximately 70 miles to the northeast, Cortez approximately 100 miles to the south, and Grand Junction approximately 125 miles to the north. The main transportation route into the area is State Highway 145 and County Road 44 ZS. All project lands lie in the San Miguel River drainage basin. The San Miguel River is tributary to the Dolores River. Water that enters the project area is collected from high mountain water sheds to the south and east. The present main source of water to the Cone Reservoir is the Cone Ditch which transports water from Lone Cone Mountain in the Uncompahgre National Forest. Drawing 1124-1 is a regional location map that includes the project area. SITE DESCRIPTION The existing Cone Reservoir is located in Section 12, T43N, R13, N.M. Principal Meridian. The reservoir is impounded by a low (maximum height is 23.5 feet), long (about 2,800 feet) earthfill dam. Crest elevation is :!:8325 feet. Plans to enlarge the reservoir include raising the dam by approximately 20 feet and lengthening the dam by about 1,050 feet on the right (north) abutment and about 1,700 feet on the left (south) abutment, increasing the capacity of the reservoir by approximately 4,000 acre-feet and inundating portions of Sections 1 and 13, T43N, Range 13 West. INVESTIGATIONS Geologic field reconnaissance was performed in November, 1983. Augering and drilling of the right abutment and dam were conducted in November/December, 1983, and May/June, 1984. Seven test borings ranginJ\ from 15 to 50 feet in depth were drilled. Geologic logs of these test borings are included in -2-