Monday, 7 May 2012

Hoover Dam of Las Vegas

Hoover Dam 

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 hoover dam bridge

 

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hoover dam 
There would be no Las Vegas as we know it without Hoover Dam. Certainly, the neon and glitz that we know and love would not exist. In fact, the growth of the entire Southwest can be tied directly to the electricity created by the dam.
Until Hoover Dam was built, much of the southwestern United States was plagued by two natural problems: parched, sandy terrain that lacked irrigation for most of the year and extensive flooding in spring and early summer, when the mighty Colorado River, fed by melting snow from its source in the Rocky Mountains, overflowed its banks and destroyed crops, lives, and property. On the positive side, raging unchecked over eons, the river's turbulent, rushing waters carved the Grand Canyon. 

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In 1928, prodded by the seven states through which the river runs during the course of its 1,400-mile journey to the Gulf of California, Congress authorized construction of a dam at Boulder Canyon (later moved to Black Canyon). The Senate's declaration of intention states, "A mighty river, now a source of destruction, is to be curbed and put to work in the interests of society." Construction began in 1931. Because of its vast scope and the unprecedented problems posed in its realization, the project generated significant advances in many areas of machinery production, engineering, and construction. An army of more than 5,200 laborers was assembled, and work proceeded 24 hours a day. Completed in 1936, 2 years ahead of schedule and $15 million under budget (it is, no doubt, a Wonder of the Modern Fiscal World), the dam stopped the annual floods and conserved water for irrigation, industry, and domestic uses. Equally important, it became one of the world's major electrical-generating plants, providing low-cost, pollution-free hydroelectric power to a score of surrounding communities. Hoover Dam's $165-million cost has been repaid with interest by the sale of inexpensive power to a number of California cities and the states of Arizona and Nevada. The dam is a government project that paid for itself -- a feat almost as awe-inspiring as its engineering.
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The dam itself is a massive curved wall, 660 feet thick at the bottom, tapering to 45 feet where a road crosses it at the top. It towers 726 feet above bedrock (about the height of a 60-story skyscraper) and acts as a plug between the canyon walls to hold back up to 9.2 trillion gallons of water in Lake Mead, the reservoir created by its construction. Four concrete intake towers on the lake side drop the water down about 600 feet to drive turbines and create power, after which the water spills out into the river and continues south.
All the architecture is on a grand scale, and the design has beautiful Art Deco elements, unusual in an engineering project. Note, for instance, the monumental 30-foot bronze sculpture, Winged Figures of the Republic,flanking a 142-foot flagpole at the Nevada entrance. According to its creator, Oskar Hansen, the sculpture symbolizes "the immutable calm of intellectual resolution, and the enormous power of trained physical strength, equally enthroned in placid triumph of scientific achievement."
Seven miles northwest of the dam on U.S. 93, you'll pass through Boulder City, which was built to house managerial and construction workers. Sweltering summer heat (many days it is 125°F/52°C) ruled out a campsite by the dam. The higher elevation of Boulder City offered lower temperatures. The city emerged within a single year, turning a desert wasteland into a community of 6,000. By 1934, it was Nevada's third-largest town.
hoover dam bypass

Construction of the Mike O’Callaghan – Pat Tillman Memorial Bridge (Colorado River Bridge) is now complete!  The Mike O’Callaghan – Pat Tillman Memorial Bridge (Colorado River Bridge) is the central portion of the Hoover Dam Bypass Project. Construction on the nearly 2,000 foot long bridge (with a 1,060 foot twin-rib concrete arch) began in late January 2005 and traffic began using the Hoover Dam Bypass on October 19, 2010.  This signature bridge spans the Black Canyon (about 1,500 feet south of the Hoover Dam), connecting the Arizona and Nevada Approach highways nearly 900-feet above the Colorado River. Visit the What's New and Construction Activities pages for more details on how this project progressed through the years.

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hoover dam address 
  • Address:Hwy. 93, Boulder City
  • Hours:Open daily 9am - 6pm
  • Admission:Visitor Center $8
Hoover Dam is located approximately 30 miles southeast of Las Vegas, on the Nevada-Arizona border. The Dam does not have a street address, so directions are provided below.
Also, visitors with GPS navigators can use the coordinates: N 36.016222, W -114.737245 to locate the site.
Those who want to use an Internet map service should try one that allows input of landmark names instead of a street address.
 
Getting There 
 Drive east on Flamingo Road or Tropicana Avenue to U.S. 515 S, which automatically turns into I-93 S and takes you right to the dam. This involves a dramatic drive as you go through Boulder City and come over a rise, and Lake Mead suddenly appears spread out before you. It's a beautiful sight. At about this point, the road narrows to two lanes, and traffic can slow considerably. After the 2010 opening of a bypass bridge (dramatic on its own for its soaring height over the canyon), vehicles no longer pass directly over the bridge to get from Nevada to Arizona, but despite hopes that the bypass would make the commute better, it hasn't helped much. On a normal day, getting to the dam will take about an hour.
Go past the turnoff to Lake Mead to Nevada State Route 172, the well-marked Hoover Dam Access Road. As you near the dam, you'll see a five-story parking structure tucked into the canyon wall on your left. Park here ($7 charge) and take the elevators or stairs to the walkway leading to the visitor center.
If you would rather go on an organized tour, check out Gray Line(tel. 800/634-6579; www.grayline.com), which offers a half-day tour of the dam from $60 or a daylong tour that includes a paddleboat cruise of Lake Mead and a tour of the Ethel M Chocolate factory from $92.
Inside Photo

Construction Photo

 

hoover dam visit

Dam Statistics - Hoover Facts

  1. 1,244 feet wide (379 m)
  2. 660 feet (203 m) thick at the base
  3. 45 feet (13 m) thick at the top
  4. $165 million dollars to build
  5. 4.5 years to build
  6. 4.4 million yards of concrete used for construction
  7. March 1931 building began
  8. September 30, 1935 President Franklin D. Roosevelt dedicated the completed dam

Powerhouse

  1. 17 generators
  2. 4+ billion kilowatt hours produced each year
  3. 10 acres of floor space

Power used by:

  1. 56% California
  2. 25% Nevada
  3. 19% Arizona

Lake Mead

  1. 6.5 years to fill (A slow filling process was required to lessen the pressure change on the dam and to help prevent small earthquakes due to land settlement.)
  2. 589 feet (181 m) at the deepest point
  3. 247 square miles in size
  4. 110 miles (176 km) long
  5. Named after Dr. Elwood Mead, Commissioner of the Bureau of Reclamation (1924 - 1936)
  6. Largest man made reservoir in the United States

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