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Show ( j) Mona Dam and Reservoir Alternative An alternative location for Mona Dam is about 2 miles downstream from the planned location. Environmental impacts would include inundation of about 1150 acres of farm and brush land and 2 miles of stream. This site would also require about 2^ 0,000 cubic yards of fill and a correspondingly larger borrow area than would be required for the 50,000 cubic yards of embankment needed at the upper site. c* Indian Fishery Mitigation Features The diversion of flows from the Duchesne River tributaries would have an effect on the fishery in some reaches of these streams where they flow through Indian lands. This effect has been studied by the various agencies involved. It was recommended by the Bureau of Sport Fisheries and Wildlife- 1- that fishery lakes with a total surface area of about 800 acres be constructed to replace this loss. It was later recommended by the Bureau of Indian Affairs and the Ute Indian Tribe^ that this loss be mitigated by two reservoirs: Bottle Hollow, now constructed on an off- stream site near Fort Duchesne and Lower Stillwater, which would be constructed on Rock Creek. These reservoirs would be maintained at a constant water level. A large number of water storage sites were inventoried, and 27 sites were selected for further investigation. They are located on or adjacent to the following streams: Rock Creek, nine sites; Duchesne River, three sites; Lake Fork River, one site; Uintah River, two sites; Willow Creek, four sites; Hill Creek, six sites; Farm Creek, one site; and Dry Canyon, one site. For productivity as a fishery and for tribal economic development, potential storage sites should be located on or near tribal lands, have ample water inflow to equal or exceed the seasonal evaporation loss, and have a minimum water depth of 25 feet and an average depth of at least 10 feet for the entire reservoir. In addition, water fluctuation should be at a minimum, and outlets should be provided for the reservoirs to control outflow and for possible complete drainage for silt- and fish- control measures. A spillway would be needed to carry the water from the drainage source. Shoreline slopes should not be too steep. Adequate fisherman access roads should be constructed to the impoundments and tribal facilities. All vegetation should be removed from within the backwater area of each impoundment. Esthetics should also be considered. 623 |
