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<br />. <br /> <br />. <br /> <br />. <br /> <br />Draft <br />1/22-23/87 <br /> <br />Colorado Water Conservation Board <br />1313 Sherman Street, Room 721 <br />Denver, Colorado 80203 <br /> <br />Twin Lakes Reservoir project <br />(City of Greeley) <br /> <br />Introduction <br /> <br />Twin Lakes Reservoir is one of several high elevation <br />storage units owned by the City of Greeley. It is located in <br />Larimer County about nine miles south of Rustic, The dam for <br />this reservoir is 35 feet in height and has a crest length of <br />220 feet. It was constructed in the early 1900s by an unknown <br />group of investors. The reservoir has a decreed storage <br />capacity of 460 acre-feet, but at the normal maximum water <br />surface elevation it can currently store only 268 acre-feet. <br /> <br />Problem <br /> <br />On January 22, 1986, the State Engineer restricted the <br />storage in this reservoir to zero capacity due to the <br />deteriorated condition of the outlet works and excessive <br />embankment seepage. As this restriction will remain until <br />steps are taken to correct these problems, the city had a <br />feasibility study prepared to address these matters. This <br />study was performed by Morrision-Knudsen Engineers, Inc., of <br />Denver, and is the basis for the recommendation on this project. <br /> <br />Proposed Project <br /> <br />The alternative selected by the engineering consultant from <br />among four was to replace the existing dam spillway and outlet <br />works with a new roller-compacted concrete (RCC) dam and outlet <br />works to provide a 460 acre-foot reservoir. A new spillway <br />would be constructed within the RCC dam to pass the 100-year <br />flood. Higher intensity flooding events would overtop the dam, <br />but no erOding of the RCC would be expected, The estimated <br />cost of the proposed project is $825,000. <br /> <br />2338E <br />