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<br />o <br />C) <br />>- <br /> <br />(.n <br /> <br />~ <br /> <br />State Hl~~way No. 280. A concrete-lined, open-channel type spill- <br />way with two 21-foot by 20-foot radial gates will pass 12,000 efs <br />of overflow at reservoir stage 8280. A concrete-lined, 1l.5-foot <br />diameter outlet tunnel leads from an Inl~t trashrack structure in <br />the reservoir and extends 1,065 feet through the left abutmBnt to <br />the river below the dam. This tunnel was utilized to divert the <br />river during construction of ~he dam. An outlet gate-chamber <br />containing two sets of control valv~s 1s located at the base of <br />an elevator shaft that can be entffred from the crest of the dam. <br />The control valves include a 30-inch gate valve and a 30-inch <br />hollo\.l-Jet valve in one set and a 1.4-inch cone valve and a 14- <br />inch hollow-Jet valve in the other. Capacitlus of the two <br />operating outlets are 380 e1's and 70 cfs, resp~ct1vely. <br /> <br />Dikes Nos. l, 2, and 4, connected to form a single structure, <br />have a crest length of 4,4l5 f~et, a maxLmum height of 80 feet <br />above foundation, and a volume of 945,000 cubic yards. Dike <br />No. 3 has a crest length of 1,815 feet, a maximum height of 65 <br />feet, and a volume of 723,558 cubic yards. Tho crests of Dikes <br />Nos. 1, 2, and 3 are traversed by relocated State Highvay No. 280. <br /> <br />I <br /> <br /> <br />Dovnstream Face of Granb)" Dam. <br /> <br />II <br />