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.;'~ !*''#In Juan-Chama Project Colorado: Archuleta and Mineral Counties New Mexico: Rio Arriba and Santa Fe Counties Southwest Region . Water and Power Resources Service The San J uan-Chama Project, authorized as a par- ticipating project 01 the Colorado River Storage Project, provides an average annual diversion 01 about IIO,OOO acre-leet 01 water lrom the upper tributaries 01 the San Juan River lor use in the Rio Grande Basin, New Mexico. The additional water is used lor municipal, domastic, and industrial purposes: In the city 01 Albuquerque, 48,200 acre-leet; city and county 01 Santa Fe, 5,605 acre- leet; city 01 Los Alamos, 1,200 acre-leet; village 01 Los .J1',mas, 400 acre-leet; Twining Water and Sanitation <~;~!ktrict, IS acre-leet; and city 01 Espanola, 1,000 acre- l~et. Supplemental water is provided lor irrigation 01 89,7II acres in the Middle Rio Grande Conservancy District and 2,768 acres in the Pojoaque Valley Irrigation District. An annual allocation 01 5,000 acre-leet 01 water is made available lor lish and wildlife and recreation purposes at Cochiti Reservoir (a Corps 01 Engineers Project). There is an allocated but as yet uncontracted supp Iy 01 18,450 acre-leet. It,t .:-q() lljlq~) , v PLAN Blanco Diversion Dam on Rio Blanco diverts water to the Blanco Feeder Conduit, a closed conduit 01 520 cubic feet per seeond capacity which conveys the water to Blanco Tunnel. Blanco Tunnel is a concrete-lined struc- ture with 520 cubic leet per second capacity to carry water 8.64 miles lrom Rio Blanco to Little Navajo River. Little Oso Siphon, a concrete siphon with a eapacity 01 520 eubie feet per second, carries water under Little Navajo River to Oso Tunnel. Little Oso Diversion Dam on the Little Navajo River upstream lrom the Little Oso Siphon diverts water lrom the Little Navajo River through the Little Oso Feeder Conduit, a closed conduit ,'..',\h a capacity of 150 cubic feet per second, to the Oso '.;nnel. The Oso Tunnel is a concrete-lined structure with a capacity 01 550 cubic leet per seeond and a length 01 5.05 miles. It carries water lrom Little Navajo River to Navajo River. The 550.cubic-foot-per.second Oso Siphon w -, Pc>,~ I'n' JS8R. 1I1b..v;..erf"'''' SC6'-7~"-5:!:'8) conveys water under the Navajo River when the Oso Diversion Dam diverts water to the Oso Feeder Conduit. This conduit, with a capacity 01 650 cubic leet per second, extends lrom 080 Diversion Dam to Azotea Tunnel. The 12.8-mile-Iong concrete-lined Azotea Tunnel, with a capacity 01 950 cubic leet per second, conveys water lrom Navajo River to Azotea Creek in the Rio Grande Basin. These imported waters Ilow down Azotea and Willow Creeks II.78 river miles to Heron Reservoir. The regulating and storage reservoir is formed by Heron Dam on Willow Creek just above the point where Willow Creek enters the Chama River. The dam is an eartbfill structure 275 leet high which lorms a reservoir with a capacity 01 401,320 acre-leet and a surface area 01 5,950 acres. The spillway has a capacity 01 660 eubic leet per second, and the outlet works has a capacity 01 4,160 cubic leet per second. The outlet works lor EI Vado Dam were enlarged in 1965-66 so that San Juan-Chama Project releases lrom Heron Reservoir could be passed unimpeded tbroughEI Vado Reservoir. The capacity 01 the outlet worka is 6,600 cubic leet per second. Namhe Falls Dam