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Hoover Dam
Ansel Adams - National Archives 79-AAB-01.jpg
Hoover Dam by Ansel Adams, 1941
Official name Hoover Dam
Location Clark County, Nevada / Mohave County, Arizona, U.S.
Purpose Power, flood control, water storage, regulation, recreation
Status Operational
Construction began 1931
Opening date 1936
(85 years ago)
 (1936)
Construction cost $49 million (1931 budget)
($639 million in 2016 dollars2016)
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, Side channel
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
2× 127 MW
1× 68.5 MW
1× 61.5 MW Francis-type
2× 2.4 MW Pelton-type
Installed capacity 2,080 MW
Capacity factor 23%
Annual generation 4.2 TWh (15 PJ)
Website
Bureau of Reclamation: Lower Colorado Region - Hoover Dam
Hoover Dam
2017 Aerial view Hoover Dam 4774.jpg
Nearest city Boulder City, Nevada
Built 1933
Architect Six Companies, Inc. (structural), Gordon Kaufmann (exteriors)
Architectural style Art Deco
MPS Vehicular Bridges in Arizona MPS (AD)
NRHP reference No. 81000382
Significant dates
Added to NRHP April 8, 1981
Designated NHL August 20, 1985

The Hoover Dam is a large dam on the Colorado River. It is on the border of the states of Arizona and Nevada. The reservoir it made is called Lake Mead. The dam is named after the former US President Herbert Hoover. At first it was called "Boulder Dam", but the name was changed to honor Hoover, who was president when the idea of building the dam started.


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