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Storage Allocation (acre- <br />Ditch Structure Structure ID feet) <br />Acton Ditch 580500 242 <br />Big Mesa Ditch 580539 444 <br />Bird Ditch 580541 125 <br />Buckingham Mandall 580564 374 <br />Coal Creek Ditch 580589 435 <br />Fix Ditch 580643 81 <br />Hernage & Kolbe 580684 82 <br />Lindsey Ditch 580738 394 <br />Mandall Ditch 580763 386 <br />Mill Ditch No. 1 580777 81 <br />Pennsylvania Ditch 580821 50 <br />Stillwater Ditch 584685 2,331 <br />Town of Yampa 580954 100 <br />No Structure in Model N/A 50 <br />TOTAL 5,175 <br />Based on historical delivery information provided by the water commissioner, diversion <br />of storage water from Stillwater Reservoir No. 1 into the Stillwater Ditch (WDID <br />584685) is approximately 58 percent to the Yampa River drainage and 42 percent to the <br />Colorado River drainage (see previous discussion for the Stillwater Ditch). Deliveries to <br />the Colorado River (via Egeria Creek) are 100 percent depletive to the streamflow of the <br />Yampa (Bear) River. <br />2.9. Yamcolo Reservoir <br />Yamcolo Reservoir (WDID 584240) is owned and operated by the UYWCD and is used <br />to provide supplemental irrigation water supplies to the critically water short reaches of <br />the upper Yampa River (Bear River). According to an elevation-area-capacity table <br />obtained from the UYWCD, the total capacity of the reservoir at the spillway is <br />approximately 9,096 acre-feet and the capacity at the invert of the outlet works (dead <br />storage) is approximately 1,068 acre-feet, resulting in an active capacity of approximately <br />8,028 acre-feet. This same area capacity data was used by the Division 6 engineer to <br />develop a regression equation relating the reservoir water surface area to the reservoir <br />capacity: <br />Surface Area = 3.05*(Capacity)^0.46 <br />Yampa River Basin Information 2-10 <br />