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I I I I I PROJECT SUMMARY I I I I The purpose of this report is to evaluate the feasibility of rehabilitation of Coon Creek Reservoirs ~l and ~2, located on Grand Mesa, about 25 miles east of Grand Junction. Both reservoirs are owned by the Coon Creek. Reservoir and Ditch Company (hereafter referred to as the Coon Creek Reservoir company), and provide irrigation water to 1644 acres of alfalfa and pasture land near Mesa, Colorado. The State Engineer has inspected the dams of both reservoirs and has ordered major repairs for Coon Creek Reservoir ~l and minor repairs for Coon Creek Reservoir ~2. Until the repairs are completed, the water level on Coon Creek Reservoir ~l has been restricted to 5 ft. below the spillway. The State Engineer also previously imposed a zero storage restriction on Coon Creek Reservoir ~2, but this has been lifted following partial repair. The restriction could be reinstated if repairs are not completed. I I I I I Water rights totaling 1474 AF have been assigned to Coon Creek Reservoirs ~l and ~2, with the ajudications date varying from 1905 to 1941. The restrictions on water level imposed by the State Engineer could result in a maximum loss of storage of about 300 AF of water and a potential loss of much of the water rights if they are not put to beneficial use. The rehabilitation and repair work required on the two reservoirs is summarized below: Coon Creek Reservoir ~l 1. Rehabilitation of a 200 ft. section of the main embankment to prevent the possibility of slumping and control seepage. In addition, the crest needs to be brought to a constant elevation and width and riprap is needed for erosion control at certain locations. I I I I I 2. Construction of a new spillway system. 3. Improvements to the outlet works (addition of a bar rack and erosion control structure, and extension of the outlet pipe). Coon Creek Reservoir ~2 1. Possible maintenance work on the control gate. 2. Enlargement and erosion control structures Eor the spillway.