Boulder Dam
| Hoover Dam | |
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Hoover Dam by Ansel Adams, 1942
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| Official name | Hoover Dam |
| Location | Clark County, Nevada / Mohave County, Arizona, U.S. |
| Purpose | Power, flood control, water storage, regulation, recreation |
| Status | In use |
| Construction began | 1931 |
| Opening date | 1936 |
| Construction cost |
$49 million (1931) $700 million (2016) |
| Owner(s) | United States Government |
| Operator(s) | U.S. Bureau of Reclamation |
| Dam and spillways | |
| Type of dam | Concrete gravity-arch |
| Impounds | Colorado River |
| Height | 726.4 ft (221.4 m) |
| Length | 1,244 ft (379 m) |
| Elevation at crest | 1,232 ft (376 m) |
| Width (crest) | 45 ft (14 m) |
| Width (base) | 660 ft (200 m) |
| Dam volume | 3,250,000 cu yd (2,480,000 m3) |
| Spillway type | 2 controlled drum-gate |
| Spillway capacity | 400,000 cu ft/s (11,000 m3/s) |
| Reservoir | |
| Creates | Lake Mead |
| Total capacity | 28,537,000 acre·ft (35.200 km3) |
| Active capacity | 15,853,000 acre·ft (19.554 km3) |
| Inactive capacity | 10,024,000 acre·ft (12.364 km3) |
| Catchment area | 167,800 sq mi (435,000 km2) |
| Surface area | 247 sq mi (640 km2) |
| Maximum length | 112 mi (180 km) |
| Maximum water depth | 590 ft (180 m) |
| Normal elevation | 1,219 ft (372 m) |
| Power station | |
| Operator(s) | U.S. Bureau of Reclamation |
| Commission date | 1936-1960 |
| Hydraulic head | 590 ft (180 m) (Max) |
| Turbines |
13× 130 MW |
| Power generation | |
| Nameplate capacity | 2,080 MW |
| Capacity factor | 23% |
| Average generation | 4.2 TWh (15 PJ) |
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Website Bureau of Reclamation: Lower Colorado Region - Hoover Dam |
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Hoover Dam
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| Nearest city | Boulder City, Nevada |
| Coordinates | 36°0′56″N 114°44′16″W / 36.01556°N 114.73778°WCoordinates: 36°0′56″N 114°44′16″W / 36.01556°N 114.73778°W |
| Built | 1933 |
| Architect | Six Companies, Inc. (structural), Gordon Kaufmann (exteriors) |
| Architectural style | Art Deco |
| MPS | Vehicular Bridges in Arizona MPS (AD) |
| NRHP Reference # | 81000382 |
| Significant dates | |
| Added to NRHP | April 8, 1981 |
| Designated NHL | August 20, 1985 |
$49 million (1931)
13× 130 MW
2× 127 MW
1× 68.5 MW
1× 61.5 MW Francis-type
2× 2.4 MW Pelton-type
Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30, 1935, by President Franklin D. Roosevelt. Its construction was the result of a massive effort involving thousands of workers, and cost over one hundred lives. The dam was controversially named after President Herbert Hoover.
Since about 1900, the Black Canyon and nearby Boulder Canyon had been investigated for their potential to support a dam that would control floods, provide irrigation water and produce hydroelectric power. In 1928, Congress authorized the project. The winning bid to build the dam was submitted by a consortium called Six Companies, Inc., which began construction on the dam in early 1931. Such a large concrete structure had never been built before, and some of the techniques were unproven. The torrid summer weather and lack of facilities near the site also presented difficulties. Nevertheless, Six Companies turned over the dam to the federal government on March 1, 1936, more than two years ahead of schedule.
Hoover Dam impounds Lake Mead, the largest reservoir in the United States by volume (when it is full). The dam is located near Boulder City, Nevada, a municipality originally constructed for workers on the construction project, about 30 mi (48 km) southeast of Las Vegas, Nevada. The dam's generators provide power for public and private utilities in Nevada, Arizona, and California. Hoover Dam is a major tourist attraction; nearly a million people tour the dam each year. The heavily-traveled U.S. Route 93 (US 93) ran along the dam's crest until October 2010, when the Hoover Dam Bypass opened.
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Wikipedia