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Show An alternative location for the Rhodes Diversion Structure is being investigated which is about 600 feet downstream from the proposed site. At this location the structure would be a diversion dam with an overflow spillway and wing dikes having a total length of about 180 feet in lieu of the stream inlet structure at the upstream or proposed site. The adverse environmental impact with the proposed plan would be less than with the alternative. ( c) Aqueduct Regulation Reservoirs . U Upper Stillwater Dam and Reservoir The Bureau of Reclamation has recently adopted a plan for a rockfill dam with an asphalt membrane core, in lieu of the earth and rockfill structure proposed in the Definite Plan Report. This plan was suggested by the U. S. Forest Service and others as a means of eliminating the borrow areas downstream from the dam. These borrow areas would be located on 250 acres of naturally forested area where they would damage an existing primitive campground and a concession- operated resort. If this alternative plan were followed, the Yellow Pine Campground located about k miles downstream from the Upper Stillwater Damsite would be developed as a replacement for the damaged campground. A rockfill dam with an earth core was also considered to reduce the amount of borrow outside the reservoir basin as included in the proposed plan. Under this alternative a new concept for excavation of embankment proposed by the Forest Service would be employed. The borrow would not be taken from one large continuous area, but would be excavated in such a manner as to create a series of potholes. When these pothole areas are shaped, finished, and filled with water, this area would appear similar to the mountain glacier lakes which are common in the higher Uinta Mountain areas. Portions of the disturbed areas below the dam could be leveled, shrubs planted, and the area utilized as an administrative and recreational site. The Forest Service concept for borrow area development has merit and should be applied in similar situations elsewhere in the Bonneville Unit. 583 |
