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similar to the CWCB instream flow rights, 55 cfs from May 1 through September 30 and 37 <br />cfs for the remaining months. There are no CWCB instream flow rights on the Little Navajo <br />River. For modeling purposes, the monthly maximum of bypass requirements and CWCB <br />minimum flows are used. <br />The San Juan Chama Project does not have any decreed water rights and is not listed in the <br />state engineer's tabulation of water rights. The Division 7 Engineer administers these rights <br />as being the most junior water rights on the stream and the San Juan Model represents the <br />project accordingly. Generally, the minimum bypass requirements shown above are <br />sufficiently high to protect the diversions of the other existing water rights on these tributary <br />streams. For purposes of the San Juan Model, the monthly minimum bypass at each headgate <br />is assumed to be the greater of the legislated bypass flows shown above or the CWCB <br />instream flow rights. <br />The historical monthly diversions at each of the diversion structures were obtained from the <br />USBR and are incorporated into the San Juan Model to represent historical conditions over <br />the 1975 through 2002 study period. For future planning scenarios, the San Juan Chama <br />Project diversions should reflect the 1995 priority date and the minimum bypass <br />requirements discussed above. The diversions should also be limited by the following <br />structure capacities, based on the USBR's design capacities of the various diversion works: <br />USBR Structure Design Capacities <br />Name WDID Capacity (cfs) <br />Rio Blanco 294667 520 <br />Little Navajo 774636 150 <br />Navajo River 774635 650 <br />Azotea Tunnel Capacity 950 <br />2.2 Montezuma Valley Irrigation Company <br />The Montezuma Valley Irrigation Company (MVIC) is the major distributor of water to the <br />McElmo Creek drainage near the town of Cortez. Historically, the MVIC provided irrigation <br />water for about 37,500 acres of land in the Montezuma Valley and also contracted to provide <br />conveyance facilities for the delivery of municipal and domestic water for Cortez, Towaoc <br />and some of the surrounding rural areas. <br />Prior to the construction of McPhee Dam and Reservoir, the principal feature of the USBR's <br />Dolores Project, the MVIC diverted its water supplies from the Dolores River about one mile <br />downstream from the town of Dolores and conveyed them transbasin to the Montezuma <br />Valley through two canal structures, the Main Canals No. 1 and No. 2. The imported water <br />was then distributed to the users via an extensive ditch and lateral system. Main Canal No. 1 <br />delivered the water through a tunnel and into the eastern and northeastern portions of the <br />Valley via the West Lateral, Hartman Draw and the East Lateral. The service area under this <br />portion of the system extends to the south side of Highway 160 to near the town of Towaoc. <br />The southern portion of the service area is at the boundary of the Ute Mountain Ute Indian <br />Reservation in the headwaters of Navaj o Wash, a tributary of the Mancos River. The eastern <br />San Juan & Dolores River Basin Information 2-3 <br />