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Colorado River -
Davis Dam spans the Colorado River in Pyramid Canyon 67 miles downstream from Hoover Dam and 88 miles upstream from Parker Dam. The Mexican Treaty of 1944 required the United States to construct Davis Dam for regulation of water to be delivered to Mexico. The reservoir formed by the dam, Lake Mohave, is used for that purpose through integrated operations of Hoover and Davis Powerplants.
Davis Dam, rising 200 feet above the lowest point of the foundation and about 140 feet above the level of the river, is a zoned earthfill structure with concrete spillway, intake structure, and powerplant. It has a crest length of 1,600 feet, and a top width of 50 feet. Its reservoir, Lake Mohave, has a total storage capacity of 1,818,300 acre-feet, and at maximum capacity extends 67 miles upstream to the tailrace of the Hoover Powerplant.
Almost 5 million cubic yards of rock and earth were excavated to form the diversion and forebay channel and foundations for the dam, spillway and intake structures, and powerplant. More than 3,642,000 cubic yards of earth and rockfill were required to form the dam, and about 600,000 cubic yards of concrete and 23 million pounds of reinforcing steel were placed in the spillway, powerplant, and other structures.
The semi-outdoor type Davis Powerplant is on the Arizona side of the river immediately downstream from the dam embankment. Water is delivered from the forebay to the powerplant through five 22-foot-diameter penstocks. The plant's nameplate capacity is 240 megawatts.
Davis Dam and Powerplant
Davis Dam and Powerplant facility was constructed by the Bureau of Reclamation in Pyramid Canyon, 67 miles downstream from Hoover Dam. The site is about 10 miles north of the point where Arizona, Nevada, and California meet and approximately 2 miles upstream from the Laughlin, Nevada, and Bullhead City, Arizona, communities.
Reclamation had investigated a possible dam site in Pyramid Canyon as early as 1902-03, but until Hoover Dam controlled the Colorado River, a dam at the Davis site was not considered practicable. In 1930, as the Hoover Dam project was moving forward, Reclamation made further investigations and explorations of the site which led to the authorization of the Davis Dam Project.
The site was named in 1941 in honor of Arthur Powell Davis, Director of Reclamation from 1914 to 1932. Davis was one of a small group of men whose courage, foresight and vision sparked the beginning of Colorado River development.
Photo - Davis Dam spillway.The Davis Dam Project was authorized April 26, 1941, and a contract for the construction of the dam and its associated structures was awarded in June 1942. However, work was halted after the War Production Board revoked priority ratings needed to obtain the necessary materials for construction. Work resumed in 1946, and the dam and powerplant were completed in 1953.
Davis Dam is an earth and rock-fill embankment with a concrete spillway, gravity structure, intake structure and powerplant. Behind the dam lies Lake Mohave which is confined for most of its length between the steep walls of Pyramid, Painted, Eldorado and Black Canyons. The lake is comparatively narrow, not more than 4 miles across at its widest point.
The primary purpose of Davis Dam is to re-regulate Hoover Dam releases to meet downstream needs including the annual delivery of 1.5 million acre-feet of water to Mexico. This is in accordance with the 1944 water treaty with Mexico. Lake Mohave also provides recreation and habitat for fish and wildlife. Additionally, the lake captures and delays the discharge of flash floods from side washes below Hoover Dam.
Located on the Arizona side of the river, the Davis Dam Powerplant is immediately downstream from the dam embankment. The forebay is formed by the intake, spillway and gravity structures.
The powerplant adds substantially to the Colorado River hydroelectric energy pool by generating 1 to 2 billion kilowatt-hours annually. This energy is used in the Southwest to turn the wheels of industry and pump water from wells to irrigate farmlands and water livestock.
The Davis Dam and Powerplant facility was constructed at the cost of approximately $67 million, which was repaid from power revenues. Contributions also came from the Federal Highway Administration and the State of Arizona for bridge and highway construction.
Lower Colorado Dams Area Office
Davis Dam is part of the Lower Colorado Dams Area Office, headquartered at Hoover Dam. The project also includes Parker Dam. Hoover, Davis and Parker Dams are operated integrally to control floods along the river and furnish hydroelectric energy through interconnections with Western Area Power Administration power systems.
Power Transmission System
Photo - View of generator shafts at Davis Dam.The Davis Dam Powerplant is linked with a federal power distribution system operated by the Western Area Power Administration. The total system consists of 2100 miles of high-voltage transmission lines serving 43 power substations in Arizona, Nevada, and California which supplies power to a number of utilities and other entities in this area.
Western's dispatching headquarters in Phoenix, the nerve center of the transmission system, can interconnect energy from the plants in the Lower Colorado River Basin with power generating facilities in the Upper Colorado River Basin and the Pacific Northwest. The facility can direct the flow of more than 4 billion kilowatt-hours of Colorado River hydroelectricenergy annually.
Lake Mohave, behind Davis Dam, is part of Lake Mead National Recreation Area administered by the National Park Service. The area around the lake and along the Colorado River below Davis Dam provides a multitude of recreational opportunities, including fishing, boating, swimming, water skiing, camping, picnicking, exploring, photography and just plain relaxing.
Facilities for public use are located at Katherine's Landing in Arizona near Davis Dam and at Cottonwood Cove east of Searchlight, Nevada. Public campgrounds are available at these locations where concessionaires provide trailer parks, restaurants, lodging, docking facilities, boat and fishing tackle equipment, and fishing licenses. A fishing license from either Arizona or Nevada to which a special-use stamp from the opposite state is attached, is required for those wishing to fish on Lake Mead or Lake Mohave. Rainbow trout are found in the cool, clear water at the upper end of Lake Mohave, while largemouth and striped bass can be taken from the lower reaches of the lake.
SELF GUIDED TOURS ARE NO LONGER AVAILABLE at Davis Dam.
THE ROADWAY OVER DAVIS DAM IS CLOSED TO PUBLIC TRAFFIC. As of April 2004, the roadway across the dam is closed to all vehicles; pedestrian and bicycle access to the dam is still allowed.
Source - U.S. Department of the Interior - Bureau of Reclamation
Davis Dam Field Division
Bullhead City, Arizona 86429
Type: Zoned earthfill
Height: 200 feet (61 meters)
Crest length: 1600 feet (488 meters)
Crest width: 50 feet (15 meters)
Base Width: 1400 feet (427 meters)
Volume of earthfill: 3.64 million cubic yards (2,784,509 cubic meters)
Number of generating units: 5
Nameplate capacity: 48 megawatts
Maximum Head: 138 feet (42 meters)
Horsepower of each turbine: 62,200
Capacity: 1,818,300 acre-feet (2,242,853,000 cubic meters)
Surface Area: 44 square miles
(114 square kilometers)
Length: 67 miles (108 kilometers)
Max lake elevation: 647 feet (197 meters)