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Show ( 16) Currant Tunnel Currant Tunnel extends 1,7 miles from Currant Creek to Layout Creek, The tunnel was holed through in October 1972 and is expected to be concrete lined by November 1973, The inlet portal is located on the steep side slope south of Currant Creek. It is on the downstream side of a very small, dry side drainage. The inlet portal is reached by the existing road along Currant Creek, This is an improved, gravel- surfaced road to the mouth of Layout Canyon for a distance of about 10 miles. The remaining section would be improved prior to construction of Currant Creek Dam, The outlet portal is located on the north side of Layout Canyon, The portal is at the base of the south- facing slope, which is generally bare and steep0 Access is by improved roads along Currant Creek to Layout Canyon, then 1.1 miles up Layout Canyon to the portal. All material excavated from Currant Tunnel was deposited in the disposal area located along Layout Canyon, east of the outlet portal, ( 17) Layout Creek Diversion Structure and Feeder Pipeline Layout Creek Diversion Structure and Feeder Pipeline are near completion. The diversion structure is located about 2 miles up the steep- sided and narrow Layout Canyon from its confluence with Currant Creek. The structure site is accessible by an improved dirt road from Currant Creek that follows Layout Canyon, ending about 1,000- feet downstream from the diversion dam. Layout Creek diversion structure consists of a reinforced concrete drop inlet structure that bifurcates the intake flow, with up to 20 c. f. s. going to the feeder line and the remainder to the sluice pipe. Flows in excess of those required for diversion and sluicing would pass over a grating which would be located at streambed elevation. Layout Feeder Pipeline extends from Layout Creek Diversion Structure to Strawberry Aqueduct, joining it at the outlet portal access structure of Currant Tunnel, It is located along the left side near the bottom of the canyon. Open flow meters located in a box near the headworks to the diversion dam measure flows diverted into the aqueduct. Construction has also been completed on a powerline to serve this structure. 54 |
