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drainage which is tributary to the Colorado River. The following absolute direct flow <br />water right is associated with the Stillwater Ditch. <br />Appropriation Administration <br />WDID Adjudication Date Date No. Amount <br />584685 6-08-1910 9-23-1903 22071.19623 30.83 cfs <br />The Company also owns Gardner Park Reservoir (WDID 583511) and Rams Horn <br />Reservoir (WDID 583532) which are located on tributaries of the Bear River and which <br />are used to supplement late season irrigation. The ditch also has a junior (1964), <br />conditional water right that is owned by the Upper Yampa Water Conservancy District <br />(UYWCD) in anticipation of a future enlargement of the ditch. <br />In addition to these owned storage reservoirs and direct flow right, the Stillwater Ditch is <br />also used to deliver storage water owned by various individuals in the Stillwater <br />Reservoir No. 1, Yamcolo Reservoir, and Stagecoach Reservoir, the latter by exchange <br />through Yamcolo Reservoir. The Division 6 engineer estimated in 1987 that <br />approximately 2,520 acres are irrigated under the Stillwater Ditch, with about 1,722 acres <br />(68 percent) in the Yampa River drainage and 798 acres (32 percent) in the Colorado <br />River drainage (Egeria Creek). These percentages would apply to all diversions made <br />pursuant to the direct flow water right in the ditch and any storage releases delivered <br />through the ditch from Gardner Park Reservoir and Rams Horn Reservoir. (The CDSS <br />1993 irrigated land mapping shows a larger amount of land under the ditch and the split <br />between Yampa basin and Colorado basin at 72 and 28 percent respectively.) All <br />deliveries to the Colorado River drainage represent a 100 percent depletion to the Yampa <br />River system. Review of detailed diversion records provided by the water commissioner <br />indicated close agreement with this relative apportionment of the diversions under the <br />direct flow right. Storage water delivered through the ditch from Stillwater Reservoir No. <br />1, Yamcolo Reservoir, and Stagecoach Reservoir is owned by specific individuals with <br />land under the ditch. Using records provided by the water commissioner, which reflect <br />the historical delivery of storage water from each of these reservoirs, the deliveries can be <br />apportioned between the two river basins in the following approximate percentages. Note <br />that these percentages are different from the percentages that would be derived based <br />solely on storage ownership and the locations of the acreage. However, use of the <br />historical delivery records is believed to best represent actual irrigation practices under <br />the Stillwater Ditch system. <br />Percent To Percent To <br />Reservoir Yampa River Basin Colorado River Basin <br />Stillwater Reservoir No.l 58 percent 42 percent <br />Yamcolo Reservoir <br />Yamcolo Irrigators Assn. 53 percent 47 percent <br />Stagecoach Contract Water 90 percent 10 percent <br />Refer to the documentation for Stillwater Reservoir No. 1, Yamcolo Reservoir, and <br />Stagecoach Reservoir for additional information concerning the operation of these <br />reservoirs. <br />Yampa River Basin Information 2-2 <br />