Hoover Dam
Hoover Dam from the air
Official name	Hoover Dam
Impounds	Colorado River
Creates	Lake Mead
Locale	Nevada-Arizona USA
Maintained by	U.S. Bureau of Reclamation
Length	1244 ft (379 m)
Height	726.4 ft (221 m)
Construction began	1931
Opening date	1936
Geographical Data
Coordinates	36°0′56″N 114°44′16″W / 36.01556, -114.73778Coordinates: 36°0′56″N 114°44′16″W / 36.01556, -114.73778

Hoover Dam
(U.S. National Historic Landmark)
Hoover Dam by Ansel Adams
Nearest city:	Boulder City, Nevada
Built/Founded:	1933
Architect:	Six Companies,Inc.
Architectural style(s):	Art Deco
Designated as NHL:	August 20, 1985[1]
Added to NRHP:	April 08, 1981[2]
NRHP Reference#:	81000382
MPS:	Vehicular Bridges in Arizona MPS (AD)
Governing body:	BUREAU OF RECLAMATION

Hoover Dam, also 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 Arizona and Nevada. When completed in 1935, it was both the world's largest electric power producing facility and the world's largest concrete structure. It was surpassed in both respects by the Grand Coulee Dam in 1945. It is currently the world's 34th largest hydroelectric generating station.^[3] This article concerns the dam in Ohio. ... The Colorado River from the bottom of Marble Canyon, in the Upper Grand Canyon Colorado River in the Grand Canyon from Desert View The Colorado River from Laughlin Horseshoe Bend is a horseshoe-shaped meander of the Colorado River located near the town of Page, Arizona The Colorado River is... Lake Mead is the largest man-made lake and reservoir in the United States. ... This article is about the U.S. State of Nevada. ... Official language(s) English Spoken language(s) English 74. ... Motto: (traditional) In God We Trust (official, 1956–present) Anthem: The Star-Spangled Banner Capital Washington, D.C. Largest city New York City Official language(s) None at the federal level; English de facto Government Federal Republic  - President George W. Bush (R)  - Vice President Dick Cheney (R) Independence - Declared - Recognized... The United States Bureau of Reclamation (Formerly the United States Reclamation Service) is a division of the U.S. Department of the Interior which oversees water development projects in the western United States. ... Map of Earth showing lines of latitude (horizontally) and longitude (vertically), Eckert VI projection; large version (pdf, 1. ... Map of Earth showing lines of latitude (horizontally) and longitude (vertically), Eckert VI projection; large version (pdf, 1. ... For other uses of terms redirecting here, see US (disambiguation), USA (disambiguation), and United States (disambiguation) Motto In God We Trust(since 1956) (From Many, One; Latin, traditional) Anthem The Star-Spangled Banner Capital Washington, D.C. Largest city New York City National language English (de facto)1 Demonym American... This article or section needs additional references or sources to improve its verifiability. ... Image File history File links Size of this preview: 748 × 599 pixelsFull resolution (1425 × 1142 pixel, file size: 629 KB, MIME type: image/jpeg) Downloaded from [2] Date 1941 Author Background notes: Ansel Adams Ansel Easton Adams (February 20, 1902 - April 22, 1984) was an American photographer, known for his... Ansel Easton Adams (February 20, 1902 – April 22, 1984) was an American photographer, best known for his black-and-white photographs of the American West. ... Boulder City is a city in Clark County, Nevada, United States. ... This article or section needs additional references or sources to improve its verifiability. ... is the 232nd day of the year (233rd in leap years) in the Gregorian calendar. ... This article is about the year. ... A typical plaque showing entry on the National Register of Historic Places. ... April 8 is the 98th day of the year in the Gregorian calendar (99th in leap years). ... AUGUST 25 1981 US Marine Sean Vance is Born on the 25th of August {ear nav|1981}} Year 1981 (MCMLXXXI) was a common year starting on Thursday (link displays the 1981 Gregorian calendar). ... Old Slater Mill, a historic district in Rhode Island, has the distinction of carrying the NRHP reference number 66000001, technically making it the first property added to National Register on November 13, 1966. ... This article is about the construction material. ... Black Canyon, photographed in 1871. ... Colorado River in the Grand Canyon from Desert View The Colorado River is a river in the southwestern United States and northwestern Mexico, approximately 1,450 mi (2,333 km) long, draining a part of the arid regions on the western slope of the Rocky Mountains. ... For other uses, see Border (disambiguation). ... For other uses of terms redirecting here, see US (disambiguation), USA (disambiguation), and United States (disambiguation) Motto In God We Trust(since 1956) (From Many, One; Latin, traditional) Anthem The Star-Spangled Banner Capital Washington, D.C. Largest city New York City National language English (de facto)1 Demonym American... A U.S. state is any one of the 50 states which have membership of the federation known as the United States of America (USA or U.S.). The separate state governments and the U.S. federal government share sovereignty. ... Official language(s) English Spoken language(s) English 74. ... This article is about the U.S. State of Nevada. ... For the town, see Coulee Dam, Washington. ...

The dam, located 30 miles (48 km) southeast of Las Vegas, is named after Herbert Hoover, who played an instrumental role in its construction, first as Secretary of Commerce and then later as President of the United States. Construction began in 1931 and was completed in 1935, more than two years ahead of schedule. The dam and the power plant are operated by the Bureau of Reclamation of the U.S. Department of the Interior. Listed on the National Register of Historic Places in 1981, Hoover Dam was designated a National Historic Landmark in 1985.^[1][4] For further information, see Las Vegas metropolitan area and Las Vegas Strip. ... Herbert Clark Hoover (August 10, 1874 – October 20, 1964), the thirty-first President of the United States (1929–1933), was a world-famous mining engineer and humanitarian administrator. ... The office of the U.S. Secretary of Commerce in the mid-20th century. ... Federal courts Supreme Court Circuit Courts of Appeal District Courts Elections Presidential elections Midterm elections Political Parties Democratic Republican Third parties State & Local government Governors Legislatures (List) State Courts Local Government Other countries Atlas  US Government Portal      For other uses, see President of the United States (disambiguation). ... The United States Bureau of Reclamation (Formerly the United States Reclamation Service) is a division of the U.S. Department of the Interior which oversees water development projects in the western United States. ... The United States Department of the Interior (DOI) is a Cabinet department of the United States government that manages and conserves most federally-owned land. ... A typical plaque showing entry on the National Register of Historic Places. ... This article or section needs additional references or sources to improve its verifiability. ...

Lake Mead is the reservoir created behind the dam, named after Elwood Mead, who oversaw the construction of the dam. Lake Mead is the largest man-made lake and reservoir in the United States. ... Bureau of Reclamation photo of Elwood Mead Elwood Mead (1858 in Patriot, Indiana – January 26, 1936) was a professor, politician and engineer who ended up heading the Bureau of Reclamation from 1924 until his death in 1936. ...

Planning and agreements

A commission was formed in 1922 with a representative from each of the Basin states and one from the Federal Government. The federal representative was Herbert Hoover, then Secretary of Commerce under President Warren Harding. In January 1922, Hoover met with the state governors of Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming to work out an equitable arrangement for apportioning the waters of the Colorado River for their states' use. The resulting Colorado River Compact, signed on November 24, 1922, split the river basin into upper and lower halves with the states within each region deciding how the water would be divided. This agreement, known as the Hoover Compromise, paved the way for the Boulder Dam Project. It was built to help keep the silt and sediment out of the Colorado River.^{[citation needed]} Herbert Clark Hoover (August 10, 1874 – October 20, 1964), the thirty-first President of the United States (1929–1933), was a world-famous mining engineer and humanitarian administrator. ... Warren Gamaliel Harding (November 2, 1865 - August 2, 1923) was the 29th (1921-1923) President of the United States and the sixth President to die in office. ... The Colorado River Compact is a 1922 agreement among seven U.S. states in the basin of the Colorado River in the American Southwest governing the allocation of the rivers water among the parties of the interstate compact. ... is the 328th day of the year (329th in leap years) in the Gregorian calendar. ... Year 1922 (MCMXXII) was a common year starting on Sunday (link will display full calendar) of the Gregorian calendar. ...

Herbert Hoover

The first attempt to gain Congressional approval for construction of Boulder Dam came in 1922 with the introduction of two bills in the House of Representatives and the Senate. The bills were introduced by Congressman Phil D. Swing and Senator Hiram W. Johnson and were known as the Swing-Johnson bills. The bills failed to come up for a vote and were subsequently reintroduced several times. In December 1928, both the House and the Senate finally approved the bill and sent it to the President for approval. On December 21, 1928, President Calvin Coolidge signed the bill approving the Boulder Canyon Project. The initial appropriation for construction was made in July 1930, by which time Herbert Hoover had become President. Download high resolution version (873x1145, 49 KB)Portrait of Herbert Hoover, taken/published December 4, 1923. ... Download high resolution version (873x1145, 49 KB)Portrait of Herbert Hoover, taken/published December 4, 1923. ... Herbert Clark Hoover (August 10, 1874 – October 20, 1964), the thirty-first President of the United States (1929–1933), was a world-famous mining engineer and humanitarian administrator. ... Phil Swing campaign photograph Philip David Phil Swing (November 30, 1884–August 8, 1963) is a former American Republican politician from Imperial County, California. ... Hiram Warren Johnson (September 2, 1866–August 6, 1945) was a leading American Progressive politician from California; he served as Governor from 1911-1917, and as a United States Senator from 1917-1945. ... is the 355th day of the year (356th in leap years) in the Gregorian calendar. ... Year 1928 (MCMXXVIII) was a leap year starting on Sunday (link will display full calendar) of the Gregorian calendar. ... John Calvin Coolidge, Jr. ... Herbert Clark Hoover (August 10, 1874 – October 20, 1964), the thirty-first President of the United States (1929–1933), was a world-famous mining engineer and humanitarian administrator. ...

Early plans called for the dam to be built in Boulder Canyon, so the project was known as the Boulder Canyon Project. The dam site was eventually moved downstream eight miles to Black Canyon, but the project name remained the same.

Contractors

The contract to make the Boulder Dam was awarded to Six Companies, Inc. on March 11, 1931,^[5] a joint venture of Morrison-Knudsen Company of Boise, Idaho; Utah Construction Company of Ogden, Utah; Pacific Bridge Company of Portland, Oregon; Henry J. Kaiser & W. A. Bechtel Company of Oakland, California; MacDonald & Kahn Ltd. of Los Angeles; and the J.F. Shea Company of Portland, Oregon. The chief executive of Six Companies, Frank Crowe, had previously invented many of the techniques used to build the dam. Six Companies, Inc. ... is the 70th day of the year (71st in leap years) in the Gregorian calendar. ... Year 1931 (MCMXXXI) was a common year starting on Thursday (link will display full 1931 calendar) of the Gregorian calendar. ... Washington Group International provides integrated engineering, construction and management services to businesses and governments around the world. ... Boise redirects here. ... A construction company founded by Edmund Orson Wattis, Jr, Warren L. Wattis and William H. Wattis in 1900. ... Ogden sign over Washington Boulevard at the Ogden River; toward downtown Ogden is a city in and the county seat of Weber County,[3] Utah, United States. ... Nickname: Location of Portland in Multnomah County and the state of Oregon Coordinates: , Country State Counties Multnomah, Washington, Clackamas Incorporated February 8, 1851 Government  - Type Commission  - Mayor Tom Potter[1]  - Commissioners Sam Adams Randy Leonard Dan Saltzman Erik Sten  - Auditor Gary Blackmer Area  - City 376. ... Henry J. Kaiser Henry John Kaiser (May 9, 1882—August 24, 1967) was an American industrialist who became known as the father of modern American shipbuilding. ... Bechtel Corporation (Bechtel Group) is the largest civil engineering company in the world. ... Oakland redirects here. ... Los Angeles and L.A. redirect here. ... Six Companies, Inc. ... Frank Crowe (b. ...

During the concrete-pouring and curing portion of construction, it was necessary to circulate refrigerated water through tubes in the concrete. This was to remove the heat generated by the chemical reactions that solidify the concrete, since the setting and curing of the concrete was calculated to take about 125 years. Six Companies, Inc., did much of this work, but it discovered that such a large refrigeration project was beyond its expertise. Hence, the Union Carbide Corporation was contracted to assist with the refrigeration needs. Union Carbide of South Charleston, West Virginia is a chemical manufacturer, now a subsidiary of The Dow Chemical Company. ...

Six Companies, Inc. was contracted to build a new town called Boulder City for workers, but the construction schedule for the dam was accelerated in order to create more jobs in response to the onset of the Great Depression, and the town was not ready when the first dam workers arrived at the site in early 1931. During the first summer of construction, workers and their families were housed in temporary camps like Ragtown while work on the town progressed. Discontent with Ragtown and dangerous working conditions at the dam site led to a strike on August 8, 1931. Six Companies responded by sending in strike-breakers with guns and clubs, and the strike was soon quelled. But the discontent prompted the authorities to speed up the construction of Boulder City, and by the spring of 1932 Ragtown had been deserted.^[6] Gambling, drinking and prostitution were not permitted in Boulder City during construction. To this day Boulder City is the only location in Nevada not to allow gambling, and the sale of alcohol was illegal until 1969. Boulder City is a city in Clark County, Nevada, United States. ... For other uses, see The Great Depression (disambiguation). ... is the 220th day of the year (221st in leap years) in the Gregorian calendar. ... Year 1931 (MCMXXXI) was a common year starting on Thursday (link will display full 1931 calendar) of the Gregorian calendar. ...

While working in the tunnels, many workers suffered from the carbon monoxide generated by the machinery there. The contractors claimed that the sickness was pneumonia and was not their responsibility. Some of the workers sickened and died because of the so-called "pneumonia". Most are uncounted on the official death list. In a court case, one of the claimants (Ed Kraus) said that the poisoning had resulted in his impotence. This was disproved after a prostitute in the pay of the contractors gave evidence. The jury failed to reach a verdict as a result, and the claim was lost.^[7] Carbon monoxide, with the chemical formula CO, is a colorless, odorless, and tasteless gas. ... This article is about human pneumonia. ... Erectile dysfunction (ED) or impotence is a sexual dysfunction characterized by the inability to develop or maintain an erection of the penis. ...

Construction

Groundworks

Hoover Dam Architectural Plans

Overview Of Dam Mechanisms

To protect the construction site from flooding, two cofferdams were constructed. Construction of the upper cofferdam began in September 1932, even though the river had not yet been diverted. A temporary horseshoe-shaped dike protected the cofferdam on the Nevada side of the river. After the Arizona tunnels were completed, and the river diverted, the work was completed much faster. Once the coffer dams were in place and the construction site dewatered, excavation for the dam foundation began. For the dam to rest on solid rock, it was necessary to remove all loose material until solid rock was reached. Work on the foundation excavations was completed in June 1933. During excavations for the foundation, approximately 1,500,000 yd³ (1,150,000 m³) of material was removed, including material removed in canyon wall stripping operations. Image File history File links Download high-resolution version (1520x580, 355 KB)Freely available online item of historic interest File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Download high-resolution version (1520x580, 355 KB)Freely available online item of historic interest File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Hoover-summary-map. ... Image File history File links Hoover-summary-map. ... dam stands for dekametre. ...

River diversion

To divert the river's flow around the construction site, four diversion tunnels were driven through the canyon walls, two on the Nevada side and two on the Arizona side. These tunnels were 56 feet (17.07 m) in diameter. Their combined length was nearly 16,000 feet (4877 m, more than three miles). Tunneling began at the lower portals of the Nevada tunnels in May 1931. Shortly after, work began on two similar tunnels in the Arizona canyon wall. In March 1932, work began on lining the tunnels with concrete. First the base or invert was poured. Gantry cranes, running on rails through the entire length of each tunnel were used to place the concrete. The sidewalls were poured next. Movable sections of steel forms were used for the sidewalls. Finally, using pneumatic guns, the overheads were filled in. The concrete lining is 3 feet (914.4 mm) thick, reducing the finished tunnel diameter to 50 ft (15.24 m). Container ship Rita being loaded at Copenhagen by a portainer crane A portainer (also known as a gantry crane, container crane, container handling gantry crane, quay crane, ship-to-shore crane, STS crane or a dockside crane) is a very large crane used to load and unload container ships, and... This article is about the construction material. ...

Following the completion of the dam, the entrances to the two outer diversion tunnels were sealed at the opening and half way through the tunnels with large concrete plugs. The downstream half of the tunnels following the inner plugs are now the main body of the spillway tunnels. The spillways can be seen directly above the outer diversion tunnels. They drop sharply from their entrance point and merge directly into the old diversion tunnels.

Two intake towers on the Arizona side.

The two inner diversion tunnels have two concrete plugs in them. One is roughly half way along their length, and the other is around 75% of the way along their length. The section sandwiched between two concrete plugs is used as part of the tunnel which water travels along, to journey from the outermost intake towers and the generators. The two innermost intake towers have separate tunnels. Image File history File links Metadata Size of this preview: 800 × 483 pixelsFull resolution (2048 × 1236 pixel, file size: 909 KB, MIME type: image/jpeg) Intake towers of Hoover Dam in Lake Mead on the Arizona side. ... Image File history File links Metadata Size of this preview: 800 × 483 pixelsFull resolution (2048 × 1236 pixel, file size: 909 KB, MIME type: image/jpeg) Intake towers of Hoover Dam in Lake Mead on the Arizona side. ... Official language(s) English Spoken language(s) English 74. ...

The large spillway tunnels have only been used three times in the history of the dam; the first was during the second half of 1941 for testing. The second was for about six weeks during the summer of 1983, when record precipitation and snow-melt in the Colorado River basin drained into Lake Mead, and the third in 1999, again with heavy precipitation that filled Lake Mead.^{[citation needed][8]}

Rock clearance

Before construction began on the dam itself it was necessary to remove loose rock from the canyon walls. The design of the dam is the arch and gravity type. The load of the water in the storage reservior is resisted by both the gravity/mass of the dam, and by the arch of the dam pressing against and into the side walls of Black Canyon. Therefore, the two vertical foundations for each of the arch walls (the Nevada side and Arizona side) had to be founded on sound "virgin" rock; free of cracks and the weathering that the surface rock of the canyon walls had from thousands of years of weathering and exposure.

The men who removed this rock were called "high-scalers." While suspended from the top of the canyon with ropes high-scalers climbed down the canyon walls and removed the loose rock with jackhammers and dynamite. This article is about the construction tool. ... This article is about a high explosive. ...

Concrete pouring

The first concrete was placed into the dam on June 6, 1933. Since no structure of the magnitude of the Hoover Dam had been constructed, many of the procedures used in construction of the dam were untried. Since concrete heats up and contracts as it cures, uneven cooling and contraction of the concrete posed a serious problem. The Bureau of Reclamation engineers calculated that if the dam were built in a single continuous pour, the concrete would have taken 125 years to cool to ambient temperature. The resulting stresses would have caused the dam to crack and crumble.^[9] To solve this problem the dam was built in a series of interlocking trapezoidal columns. Each pour was no more than six inches deep. Because of this depth it is extremely unlikely that construction workers were accidentally buried alive in the concrete, contrary to popular folklore.^[10] To further cool the concrete each form contained cooling coils of 1 inch (25.4 mm) thin-walled steel pipe. River water was circulated through these pipes to help dissipate the heat from the curing concrete. After this, chilled water from a refrigeration plant on the lower cofferdam was circulated through the coils to further cool the concrete. After each layer had sufficiently cooled the cooling coils were cut off and pressure grouted by pneumatic grout guns. The concrete is still curing and gaining in strength as time goes on.^[11] is the 157th day of the year (158th in leap years) in the Gregorian calendar. ... Year 1933 (MCMXXXIII) was a common year starting on Sunday (link will display full calendar) of the Gregorian calendar. ... The United States Bureau of Reclamation (Formerly the United States Reclamation Service) is a division of the U.S. Department of the Interior which oversees water development projects in the western United States. ... Pneumatics, from the Greek πνευματικός (pneumatikos, coming from the wind) is the use of pressurized air in science and technology. ... Grout is a construction material used to embed rebars in masonry walls, connect sections of pre-cast concrete, fill voids, and seal joints (like those between tiles). ...

There is enough concrete in the dam to pave a two-lane highway from San Francisco to New York ^[12]. This page is a candidate for speedy deletion. ... This article is about the state. ...

Construction deaths

There were 112 deaths associated with the construction of the dam.^[10][13] There are different accounts as to how many people died while working on the dam and who was the first and last to die. A popular story holds that the first person to die in the construction of Hoover Dam was J. G. Tierney, a surveyor who drowned while looking for an ideal spot for the dam. Coincidentally, his son, Patrick W. Tierney, was the last man to die working on the dam, 13 years to the day later.^[10][13] 96 of the deaths occurred during construction at the site. However, another surveyor died prior while surveying a potential location for the dam and these statistics do not include other incidental and coincidental (heat stroke, heart failure, etc) deaths during construction. ^[10]

Power plant

The hydroelectric generators at Hoover dam

The seventeen turbine-generators at this powerhouse generate a maximum of 2,074 megawatts of hydroelectric power. Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (2592 × 1944 pixel, file size: 1. ... Image File history File links Metadata Size of this preview: 800 × 600 pixelsFull resolution (2592 × 1944 pixel, file size: 1. ... A Siemens steam turbine with the case opened. ... The megawatt (symbol: MW) is a unit for measuring power corresponding to one million (106) watts. ...

Excavation for the powerhouse was carried out simultaneously with the excavation for the dam foundation and abutments. Excavation for the U-shaped structure located at the downstream toe of the dam was completed in late 1933 with the first concrete placed in November 1933.

Generators at the Dam's Hoover Powerplant began transmission of electricity from the Colorado River to Los Angeles, California 266 miles (428 km) away on October 26, 1936. Additional generating units were added through 1961. Electricity (from New Latin Ä“lectricus, amberlike) is a general term for a variety of phenomena resulting from the presence and flow of electric charge. ... Los Angeles and L.A. redirect here. ... is the 299th day of the year (300th in leap years) in the Gregorian calendar. ... Year 1936 (MCMXXXVI) was a leap year starting on Wednesday (link will display the full calendar) of the Gregorian calendar. ...

Water flowing from Lake Mead through the gradually-narrowing penstocks to the powerhouse reaches a speed of about 85 miles per hour (137 km/h) by the time it reaches the turbines. The entire flow of the Colorado River passes through the turbines. The spillways are rarely used.

Hydroelectric power plants have the ability to vary the amount of power generated, depending on the demand. Steam turbine power plants are not as easily "throttled" because of the amount of thermodynamic inertia contained in their systems. Hydroelectric dam diagram The waters of Llyn Stwlan, the upper reservoir of the Ffestiniog Pumped-Storage Scheme in north Wales, can just be glimpsed on the right. ... This article or section does not adequately cite its references or sources. ... A rotor of a modern steam turbine, used in a power plant A steam turbine is a mechanical device that extracts thermal energy from pressurized steam, and converts it into useful mechanical work. ...

Architectural style

The dam crosses the border between two time zones, the Pacific Time Zone and the Mountain Time Zone

The initial plans for the finished facade of both the dam and the power plant consisted of a simple, unadorned wall of concrete topped with a Gothic-inspired balustrade and a powerhouse that looked like little more than an industrial warehouse. This initial design was criticized by many as being too plain and unremarkable for a project of such immense scale, so Los Angeles-based architect Gordon B. Kaufmann was brought in to redesign the exteriors. Kaufmann greatly streamlined the buildings, and applied an elegant Art Deco style to the entire project, with sculptured turrets rising seamlessly from the dam face and clock faces on the intake towers set for Nevada and Arizona time, in the Pacific and Mountain time zones respectively (although because Arizona does not observe daylight saving time, the two clocks show the same time throughout much of the year). Hoover Dam spans two time zones File links The following pages link to this file: Hoover Dam Categories: User-created public domain images | Images of Nevada ... Hoover Dam spans two time zones File links The following pages link to this file: Hoover Dam Categories: User-created public domain images | Images of Nevada ...  PST or UTC-8 The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC-8). ... Mountain Standard Time (MST) is UTC-7, Mountain Daylight Time (MDT) is UTC-6 The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC-7) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time... For other uses, see facade (disambiguation). ... The western facade of Reims Cathedral, France. ... A page of fanciful balusters from A Handbook of Ornament, Franz S. Meyer, 1898 A baluster (through the French balustre, from Italian balaustro, from balaustra, pomegranate flower [from a resemblance to the post], from Lat. ... Flag Seal Nickname: City of Angels Location Location within Los Angeles County in the state of California Coordinates , Government State County California Los Angeles County Mayor Antonio Villaraigosa (D) Geographical characteristics Area     City 1,290. ... Gordon Kaufmann was an American architect mostly known for his work on the Hoover Dam. ... Asheville City Hall. ...  PST or UTC-8 The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC-8). ... Mountain Standard Time (MST) is UTC-7, Mountain Daylight Time (MDT) is UTC-6 The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC-7) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time... Although DST is common in Europe and North America, most of the worlds people do not use it. ...

Use for road transport

U.S. Highway 93 on Hoover Dam

Hoover Dam serves as a crossing for U.S. Route 93. The two lane section of road approaching the dam is narrow, has several dangerous hairpin turns, and is subject to rock slides. Download high resolution version (1000x710, 137 KB)Image taken in April 2004 by Daniel Mayer. ... Download high resolution version (1000x710, 137 KB)Image taken in April 2004 by Daniel Mayer. ... U.S. Route 93 is a major north-south United States highway in the Western United States. ... This article is about geological phenomenon. ...

Additionally, in the wake of the September 11, 2001 terrorist attacks there are significant security concerns. Because of the attack the Hoover Dam Bypass project was expedited. The Hoover Dam Bypass is scheduled to be completed in 2010 and will divert US 93 traffic 1,500 feet downstream of the dam.^[14] The bypass will include a composite steel and concrete arch bridge, tentatively named the Mike O'Callaghan-Pat Tillman Memorial Bridge. A sequential look at United Flight 175 crashing into the south tower of the World Trade Center The September 11, 2001 attacks (often referred to as 9/11—pronounced nine eleven or nine one one) consisted of a series of coordinated terrorist[1] suicide attacks upon the United States, predominantly... Hoover Dam Bypass refers to the construction of the Mike OCallaghan-Pat Tillman Memorial Bridge (proposed name) and connecting roads for a new route across the Colorado River for U.S. Highway 93. ... Hoover Dam Bypass refers to the construction of the Mike OCallaghan-Pat Tillman Memorial Bridge (proposed name) and connecting roads for a new route across the Colorado River for U.S. Highway 93. ... For other uses, see Steel (disambiguation). ... This article is about the construction material. ... An arch bridge is a bridge with abutments at each end shaped as a curved arch. ... Donal Neil Mike OCallaghan (September 10, 1929–March 5, 2004) was the governor of the U.S. state of Nevada from 1971 until 1979. ... Patrick Daniel Tillman (November 6, 1976 – April 22, 2004) was an American football player who left his professional sports career and enlisted in the United States Army in May 2002, along with his brother Kevin Tillman. ...

Traffic across Hoover Dam is now restricted. Some types of vehicles are inspected prior to crossing the dam while semi-trailer trucks, buses carrying luggage, and enclosed-box trucks over 40 feet are not allowed on the bridge at all.^[15] This traffic is diverted south to a Colorado River crossing close to Laughlin, Nevada. 18 wheeler redirects here. ... Autobus redirects here. ... Laughlin is a census-designated place (CDP) in Clark County, Nevada, United States. ...

Power distribution

One of two "Winged Figures of the Republic" by Oskar J.W. Hansen, part of the monument of dedication on the Nevada side of the dam.^[16]

The Bureau of Reclamation reports that the energy generated is allocated as follows:^[17] Image File history File linksMetadata Download high-resolution version (1327x1991, 1576 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Hoover Dam User:CGP Metadata This file contains additional information, probably added from the digital camera... Image File history File linksMetadata Download high-resolution version (1327x1991, 1576 KB) Summary Licensing File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Hoover Dam User:CGP Metadata This file contains additional information, probably added from the digital camera... The United States Bureau of Reclamation (Formerly the United States Reclamation Service) is a division of the U.S. Department of the Interior which oversees water development projects in the western United States. ...

Statistics

Downstream from Hoover Dam, showing the river, power stations, and power lines.

Aerial shot of Lake Mead and Hoover Dam showing the high-water mark of the 1983 flood season along the shore

• Construction period: April 20, 1931 – March 1, 1936
• Construction cost: $49 million ($676 million adjusted for inflation)
• Deaths attributed to construction: 112; 96 of them at the construction site^[10][13][18]
• Dam height: 726.4 ft (221.4 m), second highest dam in the United States. (Only the Oroville Dam is taller)
• Dam length: 1244 ft (379.2 m)
• Dam thickness: 660 ft (200 m) at its base; 45 ft (15 m) thick at its crest.
• Concrete: 4.36 million yd³ (3.33 million m³)
• Electric Power produced by the water turbines: 2,080 megawatts
• Traffic across the dam: 13,000 to 16,000 people each day, according to the Federal Highway Administration
• Lake Mead (full pool)^[19]
  • area: 157,900 acres (639 km²), backing up 110 miles (177 km) behind the dam.
  • volume: 28,537,000 acre feet (35.200 km³) at an elevation of 1,221.4 feet (372.3 m) .
• With 8 to 10 million visitors each year, including visitors to Hoover Dam but not all traffic across the dam, the Lake Mead National Recreation Area is the fifth busiest U.S. national park.

Image File history File links Download high resolution version (768x1024, 202 KB)Downstream from Hoover Dam, showing the river, power stations, and power lines. ... Image File history File links Download high resolution version (768x1024, 202 KB)Downstream from Hoover Dam, showing the river, power stations, and power lines. ... Image File history File links Download high resolution version (870x482, 776 KB) Summary Photo taken by Reid Sullivan aboard Southwest Airlines flight from Los Angeles to Las Vegas, summer 2005. ... Image File history File links Download high resolution version (870x482, 776 KB) Summary Photo taken by Reid Sullivan aboard Southwest Airlines flight from Los Angeles to Las Vegas, summer 2005. ... is the 110th day of the year (111th in leap years) in the Gregorian calendar. ... Year 1931 (MCMXXXI) was a common year starting on Thursday (link will display full 1931 calendar) of the Gregorian calendar. ... is the 60th day of the year (61st in leap years) in the Gregorian calendar. ... Year 1936 (MCMXXXVI) was a leap year starting on Wednesday (link will display the full calendar) of the Gregorian calendar. ... To help compare different orders of magnitude this page lists lengths between 100 m and 1 km. ... This article is about the unit of length. ... Oroville Dam is on the Feather River above the city of Oroville in Butte County, California. ... To help compare different orders of magnitude this page lists lengths between 100 m and 1 km. ... This article is about the unit of length. ... This article is about the construction material. ... The cubic yard (symbols yd³, cu. ... To help compare different orders of magnitudes this page lists volumes between 1 million and 10 million ( to ) cubic metres. ... The cubic meter (symbol m³) is the SI derived unit of volume. ... Kaplan turbine and electrical generator cut-away view. ... The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. ... Lake Mead is the largest man-made lake and reservoir in the United States. ... Lake Mead National Recreation Area is located in southern Nevada and northern Arizona. ... The parks of the United States National Park system are one type of protected area in the United States and are operated by the National Park Service. ...

The naming controversy

The dam, originally planned for a location in Boulder Canyon, was relocated to Black Canyon for better impoundment, but was still known as the Boulder Dam project. Work on the project started on July 7, 1930. At the official beginning of the project on September 17, 1930, President Hoover's Secretary of the Interior Ray L. Wilbur, announced that the new dam on the Colorado River would be named Hoover Dam to honor the then President of the United States. Wilbur followed a long-standing tradition of naming important dams after the President who was in office when they were constructed, such as Wilson Dam and Coolidge Dam. Furthermore, Hoover was already campaigning for re-election in the face of the Depression and sought credit for creating jobs. A Congressional Act of February 14, 1931, made the name "Hoover Dam" official. is the 188th day of the year (189th in leap years) in the Gregorian calendar. ... Year 1930 (MCMXXX) was a common year starting on Wednesday (link will display 1930 calendar) of the Gregorian calendar. ... is the 260th day of the year (261st in leap years) in the Gregorian calendar. ... Year 1930 (MCMXXX) was a common year starting on Wednesday (link will display 1930 calendar) of the Gregorian calendar. ... The United States Secretary of the Interior is the head of the United States Department of the Interior, concerned with such matters as national parks and The Secretary is a member of the Presidents Cabinet. ... Ray Lyman Wilbur (April 13, 1875–June 26, 1949) was a medical doctor, President of Stanford University and the 31st United States Secretary of the Interior. ... Wilson Dam is a dam in Lauderdale County in the U.S. state of Alabama. ... The Coolidge Dam is a reinforced concrete multiple dome and buttress dam 31 miles east of Globe, AZ on the Gila River. ... is the 45th day of the year in the Gregorian calendar. ... Year 1931 (MCMXXXI) was a common year starting on Thursday (link will display full 1931 calendar) of the Gregorian calendar. ...

In 1932, Hoover lost his bid for reelection to Franklin Delano Roosevelt. In his memoirs, Hoover writes of stopping to inspect progress on the dam, by night, on November 12, 1932 on his way back to Washington from Palo Alto after his defeat. He commented, "It does give me extraordinary pleasure to see the great dream I have so long held taking form in actual reality of stone and cement. It is now ten years since I became chairman of the Colorado River Commission.... This dam is the greatest engineering work of its character ever attempted by the hand of man." He went on to list its purposes, concluding, "I hope to be present at its final completion as a bystander. Even so I shall feel a special personal satisfaction." (Hoover adds a footnote to this, see below.) ^[20] Presidential electoral votes by state. ... Franklin Delano Roosevelt (January 30, 1882–April 12, 1945), 32nd President of the United States, the longest-serving holder of the office and the only man to be elected President more than twice, was one of the central figures of 20th century history. ...

When Roosevelt took office on March 4, 1933, he brought Harold Ickes with him to replace Ray Lyman Wilbur as Secretary of the Interior. Ickes wasted no time removing Hoover’s name from the Boulder Canyon Project. On May 8, 1933, Ickes issued a memorandum to the Bureau of Reclamation, which was in charge of the dam, stating, "I have your reference to the text for the pamphlet descriptive of the Boulder Canyon Project for use at the Century of Progress Exposition. I would be glad if you will refer to the dam as 'Boulder Dam' in this pamphlet as well as in correspondence and other references to the dam as you may have occasion to make in the future." is the 63rd day of the year (64th in leap years) in the Gregorian calendar. ... Year 1933 (MCMXXXIII) was a common year starting on Sunday (link will display full calendar) of the Gregorian calendar. ... Harold LeClair Ickes (March 15, 1874–February 3, 1952) was a U.S. administrator and political figure. ... is the 128th day of the year (129th in leap years) in the Gregorian calendar. ... Year 1933 (MCMXXXIII) was a common year starting on Sunday (link will display full calendar) of the Gregorian calendar. ...

This did not happen immediately, but over the following several years all references to "Hoover" Dam in official sources, as well as tourist and other promotional materials, vanished in favor of "Boulder" Dam.

Roosevelt died in 1945 and Harold Ickes retired in 1946. On March 4, 1947 California Republican Congressman Jack Anderson submitted House Resolution 140 to "restore" the name Hoover Dam. Anderson’s resolution passed the House on March 6; a companion resolution passed the Senate on April 23, and on April 30, 1947, President Harry S. Truman signed Public Law 43 which read: "Resolved … that the name of Hoover Dam is hereby restored to the dam on the Colorado River in Black Canyon constructed under the authority of the Boulder Canyon Project Act … . Any law, regulation, document, or record of the United States in which such dam is designated or referred to under the name of Boulder Dam shall be held to refer to such dam under and by the name of Hoover Dam." is the 63rd day of the year (64th in leap years) in the Gregorian calendar. ... Year 1947 (MCMXLVII) was a common year starting on Wednesday (link will display full 1947 calendar) of the Gregorian calendar. ... John Zuinglius Anderson (March 22, 1904 - February 9, 1981) was a U.S. Representative from California. ... is the 65th day of the year (66th in leap years) in the Gregorian calendar. ... is the 113th day of the year (114th in leap years) in the Gregorian calendar. ... is the 120th day of the year (121st in leap years) in the Gregorian calendar. ... Year 1947 (MCMXLVII) was a common year starting on Wednesday (link will display full 1947 calendar) of the Gregorian calendar. ... For other persons named Harry Truman, see Harry Truman (disambiguation). ...

Hoover writes this footnote to his comments of November 12, 1932: "Responding to a suggestion from Hiram Johnson, and with his characteristic attitude, Secretary Ickes changed the name of the dam. The hint in the above address that I should like to be present did not secure me an invitation to the dedication ceremonies conducted by President Roosevelt. I have never regarded the name as important. The important thing is a gigantic engineering accomplishment that will bring happiness to millions of people. In 1947, the Congress, by practically unanimous action, restored the name Hoover Dam — to Mr. Ickes intense indignation." ^[21]

References

Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 270th day of the year (271st in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 23rd day of the year in the Gregorian calendar. ... For the town, see Coulee Dam, Washington. ... This is a list of the largest hydroelectric power stations. ... “PDF” redirects here. ... A kibibyte (a contraction of kilo binary byte) is a unit of information or computer storage, commonly abbreviated KiB (never kiB). 1 kibibyte = 210 bytes = 1,024 bytes The kibibyte is closely related to the kilobyte, which can be used either as a synonym for kibibyte or to refer to... “PDF” redirects here. ... A kibibyte (a contraction of kilo binary byte) is a unit of information or computer storage, commonly abbreviated KiB (never kiB). 1 kibibyte = 210 bytes = 1,024 bytes The kibibyte is closely related to the kilobyte, which can be used either as a synonym for kibibyte or to refer to... This article is an overview article about the Crown chartered British Broadcasting Corporation formed in 1927. ... This article is about a book. ... The University of Oklahoma Press is a university press that is part of the University of Oklahoma. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 331st day of the year (332nd in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 266th day of the year (267th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 162nd day of the year (163rd in leap years) in the Gregorian calendar. ... The United States Bureau of Reclamation (Formerly the United States Reclamation Service) is a division of the U.S. Department of the Interior which oversees water development projects in the western United States. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 238th day of the year (239th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 317th day of the year (318th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 1st day of the year in the Gregorian calendar. ... The United States Department of the Interior (DOI) is a Cabinet department of the United States government that manages and conserves most federally-owned land. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 239th day of the year (240th in leap years) in the Gregorian calendar. ... This article is about the state. ... This article is about the state. ...

External links

Wikimedia Commons has media related to:

Hoover Dam

• Hoover Dam's official website
• Official State of Nevada Tourism Site
• Hoover Dam: Lonely Lands Made Fruitful
• Historic Construction Company Project - Hoover Dam
• Hoover Dam in the Structurae database
• BBC - Hoover Dam, industrial and social history
• Hoover Dam page
• Dams of the Lower Colorado River - Hoover Dam
• Frank Crowe - Builder of Hoover Dam
• "Boulder Dam" – Part I and Parts III and IV, documentary films from the Prelinger Archives at the Internet Archive.
• Construction of diversion tunnel #4 and spillway tunnel which drops sharply to enter diversion tunnel
• Las Vegas and Water in the West The planning and construction of Hoover Dam is the central focus of this digital library. UNLV Special Collections houses the largest collection of primary materials relating to Hoover Dam.
• PBS American experience - Hoover Dam

v • d • e U.S. National Register of Historic Places Keeper of the Register · History of the National Register of Historic Places · Property types · Historic district · Contributing property List of entries National Park Service · National Historic Landmarks · National Battlefields · National Historic Sites · National Historical Parks · National Memorials · National Monuments

v • d • e Colorado River system Dams and aqueducts (see US Bureau of Reclamation) Shadow Mountain Dam • Granby Dam • Glen Canyon Dam • Hoover Dam • Davis Dam • Parker Dam • Palo Verde Diversion Dam • Imperial Dam • Laguna Dam • Morelos Dam • Colorado River Aqueduct • San Diego Aqueduct • Central Arizona Project • All-American Canal • Coachella Canal • Redwall Dam Structurae is an on-line database containing works of structural and civil engineering of all kinds such as Bridges, High-rise buildings, towers, dams, etc. ... The Prelinger Archives are a collection of films, mostly shorts made for industrial or educational markets. ... Internet Archive headquarters is in the Presidio, a former US military base in San Francisco. ... A typical plaque showing entry on the National Register of Historic Places. ... The History of the National Register of Historic Places began in 1966 when the United States government passed the National Historic Preservation Act (NHPA), which created the National Register of Historic Places (NRHP). ... Clockwise from bottom left: a site, a building, a structure and an object. ... Helvenston House, part of the Ocala Historic District, in Ocala, Florida. ... Broadly defined, a contributing property is any property, structure or object which adds to the historical intergrity or architectural qualities that make a historic district, listed locally or federally, significant. ... Image File history File links US-NationalParkService-ShadedLogo. ... This is a list of entries on the National Register of Historic Places. ... The National Park System of the United States is the collection of physical properties owned or administered by the National Park Service. ... The Colorado River from the bottom of Marble Canyon, in the Upper Grand Canyon Colorado River in the Grand Canyon from Desert View The Colorado River from Laughlin Horseshoe Bend is a horseshoe-shaped meander of the Colorado River located near the town of Page, Arizona The Colorado River is... This article is about structures for water impoundment. ... For other uses, see Aqueduct (disambiguation). ... The United States Bureau of Reclamation (Formerly the United States Reclamation Service) is a division of the U.S. Department of the Interior which oversees water development projects in the western United States. ... Image File history File links Download high resolution version (768x1024, 146 KB) Summary My picture from the Hoover Dam down the Colorado River taken on August 31, 2001. ... The Shadow Mountain Dam is a Zoned Earthfill Dam on the Colorado River in Grand County, Colorado. ... The Granby Dam is an earthfill dam that dams the Colorado River 5. ... Glen Canyon Dam on 19 June 2005. ... The Davis Dam is a dam on the Colorado River downstream from Hoover Dam (ca. ... Parker Dam is a concrete gravity-arch dam which spans the Colorado river, at a point 155 miles downstream of Hoover Dam. ... A picture of Imperial Dam The Imperial Dam is a dam near Yuma, Arizona (USA), built in the 1930s. ... The Laguna Diversion Dam is an earthfill dam 13 miles Northeast of Yuma, Arizona creating the Laguna Reservior along the Colorado River. ... The Morelos Dam is the final dam on the Colorado River. ... Colorado River Aqueduct The Colorado River Aqueduct is a 242-mi (392 km) water conveyance in southern California in the United States. ... The Central Arizona Project Aqueduct (CAP) is a 336 mi (541 km) diversion canal in Arizona in the United States. ... The All-American Canal brings Colorado River water to the Imperial Valley in California. ... Natural features Colorado River • Rocky Mountains • Colorado River Basin • Grand Lake • Sonoran Desert • Mojave Desert • Imperial Valley • Colorado Plateau • Black Canyon • Glen Canyon • Glenwood Canyon • Gore Canyon • Grand Canyon • Marble Canyon • New River • Paria Canyon • Ruby Canyon • Westwater Canyon • Gulf of California/Sea of Cortez • Salton Sea Colorado River in the Grand Canyon from Desert View The Colorado River is a river in the southwestern United States and northwestern Mexico, approximately 1,450 mi (2,333 km) long, draining a part of the arid regions on the western slope of the Rocky Mountains. ... For individual mountains named Rocky Mountain, see Rocky Mountain (disambiguation). ... Grand Lake is a natural lake, one of the headwaters of the Colorado River in Grand County, Colorado. ... Map of the Mojave and Sonoran deserts. ... For the indigenous American tribe, see Mohave. ... The Colorado Plateau, also called the Colorado Plateaus Province, is a physiographic region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. ... Black Canyon, photographed in 1871. ... Glen Canyon Hite Crossing Bridge of Utah Highway 95 at Glen Canyon Glen Canyon, in southeastern and south central Utah and northwestern Arizona within the Vermilion Cliffs area, was carved by two rivers, the Colorado River and the San Juan River. ... View down Glenwood Canyon at Hanging Lake Rest Area. ... The Colorado River in Gore Canyon, showing the Denver and Rio Grande Western mainline Gore Canyon is a short isolated canyon on the upper Colorado River in southwestern Grand County, Colorado in the United States. ... This article is about the canyon in the southwestern United States. ... Marble Canyon is the section of the Colorado River canyon from Glen Canyon Dam to the confluence with the Little Colorado River, which marks the beginning of the Grand Canyon. ... The New River is a river that runs from Mexicali, Baja California, in Mexico into the United States through Calexico, California. ... A backpacker at the confluence of Buckskin Gulch and the Paria River. ... Ruby Canyon is a roughly 25 mile (40 km) canyon on the Colorado River located on the Colorado-Utah border in the western United States, and is a popular destination for rafting. ... Westwater Canyon. ... The Gulf of California (also known as the Sea of Cortez or Sea of Cortés; locally known in the Spanish language as Mar de Cortés or, much less frequently, Golfo de California) is a body of water that separates the Baja California Peninsula from the Mexican mainland. ... For the film, see The Salton Sea. ... Tributaries Blue River • Dirty Devil River • Dolores River • Escalante River • Eagle River • Fraser River • Gila River • Green River • Gunnison River • Kanab Creek • Little Colorado River • Paria River • Roaring Fork River • San Juan River • Virgin River• Williams Fork River Look up tributary in Wiktionary, the free dictionary. ... The Blue River, a tributary of the Colorado, is shown highlighted on a map of the western United States The Blue River is a tributary of the Colorado River, approximately 75 mi (121 km) long, in the U.S. state of Colorado. ... The Dirty Devil River near Twin Corral Box Canyon The Dirty Devil River is a tributary of the Colorado River, approximately 80 mi (129 km) long, in south central Utah in the United States. ... The Dolores River, a tributary of the Colorado, is shown highlighted on a map of the western United States The Dolores River is a tributary of the Colorado River, approximately 250 mi (402 km) long, in the U.S. states of Colorado and Utah. ... The Escalante River is a tributary of the Colorado River, approximately 90 mi (145 km) long, in southern Utah. ... The Eagle River, a tributary of the Colorado, is shown highlighted on a map of the western United States The Eagle River is a tributary of the Colorado River, approximately 70 mi (113 km) long, in west central Colorado in the United States. ... The Fraser River is a tributary of the Colorado River, approximately 40 mi (64 km) long, in north central Colorado in the United States. ... The Gila River, a tributary of the Colorado, is shown highlighted on a map of the United States The Gila River (Oodham [Pima]: Hila Akimel) is a tributary of the Colorado River, 630 mile (1,014 km) long, in the southwestern United States. ... The Green River, a tributary of the Colorado, is shown highlighted on a map of the western United States. ... The Gunnison River, a tributary of the Colorado River, is shown highlighted on a map of the western United States The Gunnison River is a tributary of the Colorado River, approximately 180 mi (290 km) long, in the U.S. state of Colorado. ... The Kanab River is one of the many tributaries of the Grand Canyon. ... The Little Colorado River is shown highlighted on a map of the United States The Little Colorado River is a tributary of the Colorado River, approximately 315 mi (507 km) long, in the U.S. state of Arizona. ... A backpacker at the confluence of Buckskin Gulch and the Paria River The Paria River is a tributary of the Colorado River, approximately 75 mi (121 km) long, in southern Utah and northern Arizona in the United States. ... The Roaring Fork River, a tributary of the Colorado, is shown highlighted on a map of the western United States The Roaring Fork River is a tributary of the Colorado River, approximately 70 mi (113 km) long, in west central Colorado in the United States. ... Categories: Stub | Colorado rivers | Utah rivers ... The Virgin River, a tributary of the Colorado, is shown highlighted on a map of the southwestern United States The Virgin River is a tributary of the Colorado River, 200 mi (322 km) long, in the southwestern United States. ... The Williams Fork River is a tributary of the Colorado River, approximately 30 mi (48 km) long, in north central Colorado in the United States. ... Major reservoirs Fontenelle Reservoir • Flaming Gorge Reservoir • Taylor Park Reservoir • Navajo Reservoir • Lake Powell • Lake Mead • Lake Mohave • Lake Havasu Fontenelle Reservoir is a reservoir located in southwest Wyoming. ... Flaming Gorge Reservoir lies 43 miles (69 km) East of Vernal, Utah on the Green River (Utah). ... The Taylor Park Reservoir is a body of water created by the Taylor Park Dam, which dams the Taylor River of Colorado. ... The Navajo Reservoir is a reservoir located in the northwest area of New Mexico and the southwest area of Colorado, in the United States. ... Lake Powell is a man-made reservoir on the Colorado River, straddling the border between Utah and Arizona. ... Lake Mead is the largest man-made lake and reservoir in the United States. ... Lake Mohave Lake Mohave is a lake formed by Davis Dam on the Colorado River, which defines the border between Nevada and Arizona in the United States. ... Lake Havasu is a large reservoir behind Parker Dam on the Colorado River, on the border between California and Arizona. ... Dependent states Arizona • California • Colorado • Nevada • New Mexico • Utah • Wyoming (See: Colorado River Compact) Official language(s) English Spoken language(s) English 74. ... This article is about the U.S. state. ... Official language(s) English Demonym Coloradan Capital Denver Largest city Denver Largest metro area Denver-Aurora Metro Area Area  Ranked 8th in the US  - Total 104,185 sq mi (269,837 km²)  - Width 280 miles (451 km)  - Length 380 miles (612 km)  - % water 0. ... This article is about the U.S. State of Nevada. ... Official language(s) None Spoken language(s) English 68. ... This article is about the U.S. state. ... Official language(s) English Capital Cheyenne Largest city Cheyenne Area  Ranked 10th  - Total 97,818 sq mi (253,348 km²)  - Width 280 miles (450 km)  - Length 360 miles (580 km)  - % water 0. ... The Colorado River Compact is a 1922 agreement among seven U.S. states in the basin of the Colorado River in the American Southwest governing the allocation of the rivers water among the parties of the interstate compact. ... Designated areas Arches National Park • Canyonlands National Park • Colorado National Monument • Dead Horse Point State Park • Glen Canyon National Recreation Area • Grand Canyon National Park • Lake Mead National Recreation Area• Rocky Mountain National Park Arches National Park preserves over 2,000 natural sandstone arches, including the world-famous Delicate Arch, in addition to a variety of unique geological resources and formations. ... Canyonlands National Park, located near Moab, Utah and the Arches National Park, was designated as a National Park on September 12, 1964. ... Colorado National Monument is a part of the U.S. National Park Service near the city of Grand Junction, Colorado, in the western part of the state. ... View of the Colorado River with Dead Horse Point in the middle Dead Horse Point State Park is a Utah state park adjacent to Canyonlands National Park, featuring a dramatic overlook of the Colorado River. ... Glen Canyon National Recreation Area (Glen Canyon NRA) is a recreation and conservation unit of the National Park Service that encompasses the area around Lake Powell in Utah and Arizona, covering 1,254,429 acres (5,076 km²) of mostly desert. ... Grand Canyon National Park is one of the United States oldest national parks and is located in Arizona. ... Lake Mead National Recreation Area is located in southern Nevada and northern Arizona. ... Rocky Mountain National Park is located in the north-central region of the U.S. state of Colorado. ...