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streamflow in Dry Creek. Also, the streamflow in Hubberson Gulch at the outcrop is ~ intermittent. At the end of year 15, the model results showed annual streamflow reductions totaling 0.74 acre-foot (1.3 percent of the annual pumpage) in Sage Creek, 0.016 acre- foot (0.028 percent of the annual pumpage) in Grassy Creek, 0.015 acre-foot (0.027 percent of the annual pumpage) in Fish Creek, and 0.035 acre-foot (0.061 percent of the annual pumpage) in the Yampa River. These reductions of the streamflow in Grassy Creek, Fish Creek and the Yampa River probably are de minimus. The reduction of the streamflow in Sage Creek, however, probably will require replacement such that senior appropriators are not injured Two of the outcrops on Sage Creek are located above Sage Creek Reservoir as shown in Plates I and 2. The model showed that the annual reduction of streamflow above Sage Creek Reservoir caused by Well No. I will be about 0.017 acre-foot at the end of 15 years. EXISTING WATER USES The operation of Pond 006 for storage of surface runoff may affect the streamflow in Dry Creek, and the operation of Well No. 1 may affect the streamflow in Sage Creek. This section of the report describes the existing water uses in the Dry Creek and Sage Creek basins and the potential impacts of the Seneca II-W Mine on these water uses. Pertinent aspects of the existing water rights in these basins are shown in Table S. Dry Creek Irrigation is the primary use of water from Dry Creek. Three diversion structures are located on Dry Creek downstream from Pond 006. These structures, in downstream order, are the J.C. Temple Ditch No. 2, the Dry Creek Ditch, and the Dry Creek Diversion. Truman Manes, Water Commissioner for Water District No. 57, was interviewed on June 23, 1988, concerning the use of water by these structures. Mr. Manes said that diversions under these ditches normally begin in May and end in September. In May and early June, the streamflow normally is sufficient to meet all water demands; however, from mid-June through September the streamflow generally is iruufficient. Currently, the curtailment of diversions is not necessary on Dry Creek because the seniority of the priorities coincide with the downstream order of the three ditches. The Hollatz Ditch is located on Hubberson Gulch, upstream of Pond 006, and has a water right that is junior to the other three ditches. This ditch is not curtailed during 5