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<br />CD <br />o <br />~ <br />~ <br /> <br />CHAPl'ER IV <br /> <br />EAST RIVER UNIT <br /> <br />Unit Features <br /> <br />Cement Creek Dam and Reservoir <br /> <br />Cement Creek Reservoir on Cement Creek would have a capacity of 4,100 <br />acre-feet and a surface area of 137 acres with the reservoir at normal wa- <br />ter surface elevation 9,267.2 feet. About 1,200 acre-feet of the capacity <br />would be active and the remaining 2,900 acre-feet would be dead and inac- <br />tive provided specifically for fish and recreation. A surcharge of 1,900 <br />acre-feet would be available in the reservoir to temporarily withhold some <br />flood flows until discharged through the spillway and outlet works. No <br />storage space has been allocated to sediment since it is estimated that <br />the sediment deposits would amount to less than 5 percent of the total ca- <br />pacity after 100 years of reservoir operation. <br /> <br /> <br />...' " <br />An <br /> <br />..... <br /> <br />aerial view of Cement Creek Reservoir site with a sketch of <br />potential high water line. <br /> <br />Cement Creek Dam would be a concrete double curvature thin arch struc- <br />ture with a maximum thickness of about 12 feet. It would contain about <br />540,000 cubic yards of material. The dam would rise 80 feet above stream- <br />bed. At the crest elevation of 9,280 feet, it would be 5 feet wide and <br />240 feet long. Aggregate for the concrete would be obtained from gravel <br />terraces along East River about 4 miles below the dam site. <br /> <br />The reservoir spillway would be an ungated chute type on the left <br />abutment and would extend a sufficient distance downstream to protect the <br />toe of the dam. The spillway would discharge over hard granite. Maximum <br /> <br />23 <br />