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Show ( 1) Lower Stillwater Dam and Reservoir The proposed dam would be located on Rock Creek about 26 miles north of Duchesne and would create a reservoir with a surface area of approximately 380 acres. ( See Figures A.- 36 and A- 3Z) The land to be inundated has received moderate use by man but native plant communities are largely intact. Present utilization of the area includes livestock grazing, fish, and wildlife habitat and outdoor recreation-- primarily under the regulation of the Ute Indian Tribe. The reservoir would inundate about 2.0 miles of good sport fish habitat that supports thriving populations of rainbow, cutthroat, brook, and brown trout as well as mountain whitefish. The streams ids and adjacent habitat that would be lost are utilized by deer, beaver, several species of squirrel, rabbits, and many other smaller animals. Moose occasionally pass through the area. While there are only a few species of birds that permanently inhabit this area, many migrants utilize it for short periods in the spring, summer, and fall. Ruffed grouse live in the brushy areas of the stream bottom land. Inundation would eliminate streamside life zones for several species of amphibians and feeding areas for reptiles. However, this habitat would largely be replaced by a stable reservoir shoreline. The reservoir would also alter migration habits of wildlife. Larger animals such as deer should have no difficulty circumventing this obstacle. About 420 acres of livestock grazing land would be lost to inundation, construction and relative development. Downstream impacts are discussed in paragraphs C3a and C4c. There would be considerable physical disturbance to the landscape of the area because of construction activities. The dam would be about 72 feet high and 1,800 feet long. It would be an earthfill structure and require about 640,000 cubic yards of material. Borrow areas would be located below the dam. The nearest source of riprap would be along Rock Creek channel upstream beyond the reservoir basin. No specific locations for sources of earthfill, riprap or gravel have yet been locatecU It is expected that extraction of these materials, 276 |