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). 'ill . COLORADO WATER CONSERVATION BOARD City of Greeley Hourglass Reservoir January, 1991 Introduction Hourglass Dam and Reservoir are located on a tributary to Beaver Creek about 9 miles south of Rustic, in Larimer County, Colorado. Hourglass Reservoir has a storage capacity of 1,693 acre-feet. The Dam and Reservoir are part of the City of Greeley's water system that is used to store water for transmission to the City's treatment plant located on the Poudre River near Bellvue, Colorado. Problem The first work at Hourglass was completed in 1898. some rehabilitation work was completed in 1967, and the reservoir returned to use. Extensive seepage developed at the downstream toe and a toe drain was installed. At near-full reservoir levels, the high seepage persisted and the State Engineer's office further restricted the storage levels. This latest action by the State Engineer's office prompted the City to have a feasibility study done to address the seepage problems. The feasibility study was performed by McCall. Ellingson-Woodward Clyde and it is the basis on which the recommendation for this project is based. Proposed Project The engineers have identified a number of safety issues which need immediate attention. These items include toe drains, chimney drain, extension of the outlet to permit downstream flattening of the embankment, armoring the spillway with riprap and armoring the left abutment groin. This work is estimated to cost $500,000. Proposed Financinq City of Greeley CWCB loan at 5 percent $250,000 250.000 Under the proposed financial plan the city would pay CWCB an annual payment of $24,086 for a l5 year period. Recommendation It is recommended that this project be authorized in the amount of $250,000 subject to the proposed terms of financing set forth above and subject to the City's demonstrating to the Board's satisfaction that it can meet its repayment obligation. DWW/GKE/bj 3755E*