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<br />
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<br />
<br />San Juan-Chams Project
<br />
<br />sidered for the transmountain diversion during the
<br />negotiation of the Upper Colorado River Basin Compact.
<br />
<br />In 1950, in the interest of coordination, the Seeretary of
<br />the Interior appointed a committee known as the San
<br />Juan River Technical Committee. A summary report was
<br />prepared in May 1950, and the committee presented
<br />progress reports in 1951 and 1952.
<br />
<br />Field work on the San Juan-Chama Project was resumed
<br />at the beginning of 1951, and interim reports were
<br />prepared by the Bureau of Reclamation through 1955,
<br />when a feasibility study was prepared. This study was
<br />supplemented in 1957 and was followed by authorization
<br />of the project. Volume I of the definite plan report,
<br />covering the diversion and regulation elements of this
<br />project, was approved on August 10, 1964.
<br />
<br />Construction
<br />
<br />.Construction of Azotea Tunnel began on April 22, 1964,
<br />and was completed on November II, 1970. Other con-
<br />struction included Blanco Diversion Dam and Tunnel,
<br />awarded on May II, 1965, and completed May 22, 1969;
<br />Little Oso and Oso Diversion Dams and Oso Tunnel,
<br />awarded on February I, 1966, and completed on Novem-
<br />ber II, 1970; Azotea Creek Channelization, awarded on
<br />August 14, 1967, and completed on December 6, 1968;
<br />Willow Creek Channelization, awarded on March 20,
<br />1969, and completed on August 2, 1970; Heron Dam and
<br />relocation of State Highway 95, awarded August 8, 1967,
<br />and completed June 9, 1971.
<br />
<br />Construction also included the enlargement of the outlet
<br />of existing El Vado Dam so Heron Reservoir releases
<br />could be bypassed through El Vado Reservoir. The con.
<br />traet was awarded on July 22, 1965, and completed
<br />December 29, 1966.
<br />
<br />Construction of Nambe Falls Dam, first part of the
<br />tributary irrigation element, was awarded on June 13,
<br />1974, and completed June 28, 1976. Additional construc-
<br />tion may be required for other irrigation units.
<br />
<br />BENEFITS
<br />
<br />The project provides a supplemental water supply for
<br />various communities, supplemental supply for irrigation,
<br />and substantial fish and wildlife and recreation benefits
<br />have been created at Heron and Nambe Falls Reservoirs
<br />and at Cochiti Reservoir.
<br />
<br />PROJECT DATA
<br />
<br />Land Areas (1977)
<br />
<br />lITigable area, initial authorization:
<br />Full irrigation service. . . .. . . . . . . . .. . . . . . ..
<br />Supplemental irrigation service. . . . . . . . . . . . .
<br />
<br />Total,",,",",,,,,,,",,,",,",,",,,,",,,,
<br />
<br />2,768 acres
<br />89,711 acres
<br />92.479 acres
<br />
<br />Climatic Conditions
<br />
<br />Annual precipitation............ .........
<br />Temperature:
<br />Maximum ...... .... .......... .... ......
<br />Minimum .... ...... ..... ..... ..........
<br />Growing season ....... ...... .............
<br />Elevation of irrigable area:
<br />Rio Grande ... ....... ..... .... ..........
<br />Tributary irrigation units..................
<br />
<br />ENGINEERING DATA
<br />
<br />Storage Facilities
<br />HERON DAM
<br />
<br />Type: Earthlill
<br />Location: On Willow Creek immediately at its
<br />conIluence with Rio Chama about 9 mi
<br />west of Tierra Amarilla, N. Mex.
<br />Construction period: 1967-71
<br />Reservoir, Heron:
<br />Storage capacity.........................
<br />Active capacity to El. 7190.8 . .. .. . .. .. .. .. .
<br />Surface area .............................
<br />Dimensions:
<br />Structural height.........................
<br />Top width...... ......... ..... ... .... ...
<br />Maximum base width .....................
<br />Crest length.............................
<br />Crest elevation ..........................
<br />Total volume............................
<br />Spillway: (part of Heron Dikel
<br />Outlet works: Concrete intake structure to Rio
<br />Chama controlled by four 4- by 6.ft outlet
<br />gates and one 12-in jet-flow gate.
<br />Maximum discharge capacity. ,. . . . .'. . . . . . . .
<br />
<br />HERON DIKE
<br />
<br />Type: Earthlill
<br />Location: 1 mi northwest of Heron Dam.
<br />Constnlction period: 1967-71
<br />Dimensions:
<br />Structural height .........................
<br />Top width..............................
<br />Maximum hase width ......................
<br />Crest length.............................
<br />Crest elevation..........................
<br />Total volwne............................
<br />Spillway: On left abutment. consisting of an
<br />approach channel, concrete crest stnlcture
<br />at EI. 7190.8, and an open 500.ft-Iong
<br />chute.
<br />Discharge capacity.......................
<br />
<br />NAMBE FALLS DAM
<br />
<br />Type: Prestressed concrete thin.arch dam.
<br />concrete thrust block, and a curved axis
<br />earth fHl embankment
<br />Location: On the Rio Nambe 25 mi north of
<br />Santa Fe, N. Mex.
<br />Construction period: 1974.76
<br />Reservoir, Namhe Falls:
<br />To~l capacit! toEl. 6826.6................
<br />Active capacity. .... ... ..... .... ... ......
<br />Surlacearea............................ .
<br />Dimensions - concrete arch dam:
<br />Structural height.........................
<br />Top width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
<br />Maximum hase width .....................
<br />Crest length .... ....... ............ ......
<br />Crest elevation (without camber) . . . . . . . . . . .
<br />
<br />1
<br />
<br />8-30 in
<br />105 OF
<br />-30 OF
<br />141.208 days
<br />4500-5200.0 It
<br />5600.8000.0 ft
<br />
<br />401,320 8cre.ft
<br />399,980 acre-ft
<br />5,950 acres
<br />275 It
<br />40 It
<br />1,535 ft
<br />1,220 It
<br />7199.0 ft
<br />3,031,121 yd'
<br />
<br />4.160 ft'/,
<br />
<br />94 It
<br />30 fl
<br />390 It
<br />2,405 ft
<br />7199.0 ft
<br />421,192 yd'
<br />
<br />660 ft3/s
<br />
<br />2,023 acre-It
<br />1.665 8cre.ft
<br />59 acres
<br />150 It
<br />5 It
<br />15 It
<br />320 It
<br />6840,0 It
<br />
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