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COLORADO RIVER STORAGE PROJECT

Navajo Unit, Colorado-New Mexico

San Juan Division

Gp^fposef0NanvaatjonDam is one of the key structures of the Colorado River Storage project. In addition to regulating the flows of the San Juan River, it will provide storage reguired for the Navajo Indian Irrigation project and make possible the upstream diversion of water for the San Juan-Chama project. It will also provide recreational and fish and wildlife conservation facilities.

Location: On San Juan River 39 miles (62.76 kilometers) east of Farmington, N. Mex.

Constructed: 1958-1963

Drainage area: 3, 190 sguare miles (8, 261 square kilometers)

Reservoir
Name: Navajo
Surface area: 15, 610 acres at elevation 6085. 0 (6, 317 hectares at elevation 1, 854. 71

Ty\ ptsrs) Active capacity: 1, 036,100 acre-feet (127, 803, 000, 000 cubic meters) Total capacity: 1, 708, 600 acre-feet at elevation 6085. 0 (210, 756, 000, 000 cubic meters

at elevation 1, 854.71 meters)
Maximum water surface elevation: 6101. 5 (1, 859. 74 meters)

Dam
Type: Zoned earthfill
Dimensions:

Structural height: 402 feet (122. 53 meters)

Hydraulic height: 388 feet (118. 26 meters)

Top width: 30 feet (9.14 meters)

Maximum base width: 2, 566 feet (782. 12 meters)

Crest length: 3, 648 feet (1, 111. 91 meters)

Crest elevation: 6108. 0 (1, 861.72 meters)

Volume: 26, 840, 863 cubic yards (20, 521, 182 cubic meters)

Spillway
Location and type: Uncontrolled concrete ogee crest and chute at right abutment
Crest elevation: 6085. 00 (1, 854. 71 meters)
Crest width: 138 feet (42. 06 meters)
Length: 1, 411 feet (430. 07 meters)

Capacity: 34, 000 second-feet at maximum water surface elevation 6101. 5 (962.78 cubic meters per second at maximum water surface elevation 1, 859.74 meters)

Main Outlet Works

Location and type: Concrete tower intake structure 280 feet (85. 34 meters) high, 18-foot 9-inch (5.72-meter) diameter concrete-lined tunnel with a gate structure and shaft for a 6- by 13-foot (1. 83- by 3.96-meter) fixed-wheel gate, access tunnels and shaft, a 110-inch-diameter (279. 40-centimeter) steel outlet pipe installed in the concrete-lined tunnel, and two 72-inch (182. 88-centimeter) hollow-jet valves and ring-follower gates, all located in the right abutment. A 30-inch-diameter (76. 20-centimeter) steel pipe encased in concrete extends from the tunnel access house to a control house for a 30-inch (76. 20centimeter) ring-follower gate and a similar-sized hollow-jet valve.

Capacity: 4, 378 second-feet at maximum water surface elevation 6101. 5 (123.97 cubic meters per second at maximum water surface elevation 1, 859.74 meters) and with both 72-inch (182. 88-centimeter) valves and the 30-inch (76. 20centimeter) valves fully open

Auxiliary Outlet Works Location and type: Concrete intake structure and concrete-lined tunnel with gate chamber for two 4- by 4-foot (1. 22- by 1. 22-meter) gates in tandem, all located in the right abutment. The tunnel upstream of the gate chamber is 7 feet (2.13 meters) in diameter, and downstream of the chamber it is horseshoe shaped, 6 by 8 feet (1. 83 by 2. 44 meters).

NAVAJO DAM AND RESERVOIR
Technical Record of Design and Construction

ERRATA

The following corrections should be made on the sheet of statistics following the title page:

Navajo Reservoir

Active capacity (in metric units) should be changed to read 1, 278, 000, 000 cubic meters.

Total capacity should be changed to read 2,107, 600, 000 cubic meters.

Auxiliary Outlet Works

Capacity (in metric units) should be changed to read 50. 26 cubic meters per second.

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Capacity: 1, 775 second-feet at maximum water surface elevation 6101. 5 (50. 26 meters per second at maximum water surface elevation 1, 859.74 meters); however, the auxiliary outlet works will not be operated when the water surface is above elevation 5920 (1, 804. 42 meters), except in emergencies.

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