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~ . ~ ~ ~ ~ ~ ~ ] ~ -- ~ . I II . . . . I) I . , Small Reservoir Feasibili~tudY S-11 . deliverable into Dillon Reservoir. Cost for rehabilitation would be $30-$40,000, However, full exercise of these water rights appears to have the potential to reduce physical supplies available to other junior water users on Ryan and Salt tick Gulches. 4. Periodic occurrences of flow below 50 cfs below Dillon Reservoir resulting from exchanges by upstream in-basin users could, under suitable institutional arrangements, be eliminated by releases from six possible sources: 1) unused allocations of Dillon storage water, 2) unused allocationS subordination water from the 3100 AF Summit County Pool, 3) releases from a new reservoir on Peru Creek, 4) releases from Goose Pasture Tarn, 5) releases from Clinton Gulch Reservoir, or 6) releases from a rehabilitated Old Dillon Reservoir. These releases would be required about once every six years and would average 370 AF. The understanding of Summit County water issues gained during the basin study and the conclusions reached as a result of that study lead to the following recommendations: 1. Operating rules for curtailment of Sales Pool releases from Green Mountain Reservoir should be reviewed to determine whether any further modifications to the proposed minimum storage targets could be made. Concurrently, users showing shortages due to these minimum targets should develop demand management plans to be implemented when the USBR projects that storage will be insufficient to meet all Sales Pool demands. 2. The County should review current allocations of the Summit County Pool and consider renegotiating some of them to alleviate shortages at Cooper Mountain and to reserve unused portions for maintenance of flows below Dillon Reservoir. 3. The County should initiate discussions with the towns of Dillon and Breckenridge and with the Climax Molybdenum Company to determine the feasibility of contracting for intermittent water supplies from Old Dillon Reservoir, Goose Pasture Tarn, and Clinton Gulch Reservoir. 4. The County should initiate debate on the desirability of a new storage facility on Peru Creek. The key objectives of these discussions should be to identify the beneficiaries of such a facility and to determine whether the intangible benefits of water quality improvement, fishery improvement, and operational.flexibility are sufficient to justify project development. Further evaluation of development costs for such a facility should be undertaken. .