OCR Text |
Show are nearly completed. Currant Tunnel was bored through in October 1972 and should be lined by November 1973, The current environmental impacts of these structures, except for the Water Hollow complex where water from the stream is being diverted, are directly associated with landscape disturbances and permanent alterations of the esthetics of the areas. The landscape disturbances include vegetatively bare areas around the diversion dams, construction camps, and tunnel portals and placement of waste materials from the tunnels. Most of the impacts are expected to be temporary. Some restoration measures have already been implemented on the Water Hollow complex. These are described in Section D. A discussion of the potential impacts of operation of these completed features is presented in paragraph C3a. About 15 miles of the Jordan Aqueduct is expected to be finished in the spring of 1973. ( See Figure A- 30.) The existing direct adverse impacts of this feature concern construction disturbances and would be mostly temporary, although the route of the pipeline would be apparent for several years even after revegetation. The 78- inch diameter pipeline has been buried and, shortly after placement, trench sections of the terrain were restored to grade and seeded. One problem area exists where the aqueduct leaves the Provo Reservoir Canal. The slope of the construction approximates 65 percent. To date this 1- acre area has been stabilized but seeding has been unsuccessful. Another attempt at revegetation will be made during 1973. All other completed sections have been seeded to grasses. 3. Impacts of Proposed Features a. Portions of Strawberry Aqueduct Collection System ( 1) Reservoirs ( a) Upper Stillwater Reservoir Construction of Upper Stillwater Dam and Reservoir ( Figures A- 8 and A- 9) would affect about 26.5 miles of Rock Creek, one of Utah's more valuable trout streams. About 1.5 miles of stream would be inundated and the rest ( except for the 2 miles inundated by Lower Stillwater Reservoir) would be subjected to reduced flows that would occur primarily during the fall and winter months. Fish habitat losses would occur below the dam, particularly in the 8 miles of Class II±' fishery between the reservoir and the Forest- Indian Boundary. Natural flows would also be reduced in T7~ Description of classification system is found in paragraph B7a. 217 |