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<br />. <br /> <br />. <br /> <br />. <br /> <br />00033!) <br /> <br />would have no significant effect on the Mancos River virgin flow analysis. The <br /> <br /> <br />population of Mancos has remainded fairly stable throughout the study period, <br /> <br /> <br />with a gradual increase occurring over the years. The 1950 and 1980 census <br /> <br /> <br />populations were 785 and 870, respectively, and water use estimates included <br /> <br />in Appendix B are consistent with this trend. <br /> <br />West Mancos Water Supply Pipeline <br />The West Mancos Water Supply Pipeline has been used to provide domestic <br />water to Mesa Verde National Park. Diversion records are available only for <br />the period of 1975 through 1980. Water usage during this period averaged 138 <br />acre-feet per year. It is estimated that diversions averaged 100 acre-feet per <br />year for the period prior to 1975, based on the lower annual number of visitors <br />at the park in the 1940's and 1950's. <br /> <br />Irrigation in Navajo Wash <br /> <br /> <br />Irrigated lands in the Navajo Wash drainage basin, a tributary of the <br /> <br /> <br />Mancos River, are located in the area north of Towaoc near the Aztec Divide. <br /> <br /> <br />Very little of the irrigated area is located on the Ute Mountain Reservation <br /> <br /> <br />lands. The water supply for irrigation in Navajo Wash is supplied from irrigation <br /> <br /> <br />canals that divert water out of the Dolores River basin. Return flows from <br /> <br /> <br />irrigation in Navajo Wash enter the Mancos River downstream of the gaging <br /> <br /> <br />station near Highway 666. <br /> <br />-14- <br /> <br />,Ji <br />