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<br />. <br /> <br />Colorado Water Conservation Board <br />1313 Sherman Street, Room 721 <br />Denver, Colorado 80203 <br /> <br />Peterson Reservoir project <br />(City of Greeley) <br /> <br />Introduction <br /> <br />Peterson Reservoir is a high elevation raw water storage <br />unit owned by the City of Greeley. It is located on a small <br />unnamed tributary of the Cache la Poudre River approximately 6 <br />miles northeast of Cameron Pass in Larimer County. Peterson Dam <br />is an earth fill dam with a maximum height of 57 feet and a <br />crest length of 175 feet. At normal maximum water surface <br />elevation, the reservoir impounds 1,252 acre-feet of water. <br /> <br />Problem <br /> <br />. <br /> <br />In August, 1982, the state Engineer restricted storage in <br />Peterson Reservoir to 536 acre-feet due to excessive seepage and <br />the high phreatic surface within the dam. In 1985, the city <br />imposed a zero storage restriction on the reservoir due to the <br />reduced discharge capacity of the outlet works caused by <br />modifications ordered by the city. <br /> <br />Since the decreed storage in this reservoir is vital to the <br />city's winter water distribution operations, the city had a <br />feasibility study performed to determine how best to rehabilitate <br />the dam so that the reservoir could once again be filled to it's <br />decreed capacity. This study was performed by Morrison-Knudson <br />Engineers, Inc., of Denver, and is the basis for the <br />recommendation on this project. <br /> <br />Proposed Proiect <br /> <br />After studying several alternative methods of rehabilitating <br />Peterson Dam, the consultants selected the one that would <br />flatten the upstream slope of the dam, replace the operating <br />gate, replace the "inlet and outlet structures, place a steel <br />liner insert in the existing outlet works, armor plate the <br />existing spillway with roller compacted concrete, armor plate <br />the upstream slope of the dam with soil cement, and make <br />provisions to reduce. control and collect the embankment <br />seepage.' The estimated cost of this project is $760,000. <br /> <br />. <br /> <br />2351E <br />