HOOVER DAM
G'day folks,
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.
In the early 20th century, the U.S. Bureau of Reclamation
devised plans for a massive dam on the Arizona-Nevada border to tame the
Colorado River and provide water and hydroelectric power for the developing
Southwest. Construction within the strict timeframe proved an immense
challenge, as the crew bored into carbon monoxide-choked tunnels and dangled
from heights of 800 feet to clear canyon walls. The largest dam in the world at
the time of its completion in 1935, this National Historic Landmark stores
enough water in Lake Mead to irrigate 2 million acres and serves as a popular
tourist destination.
At the
turn of the 20th century, farmers sought to divert the Colorado River to budding Southwestern communities via a
series of canals. When the Colorado broke through the canals in 1905, creating
the inland Salton Sea, the job of controlling the raging river fell to the U.S.
Bureau of Reclamation.
Bureau
director Arthur Powell Davis in 1922 outlined a plan before Congress for a
multipurpose dam in Black Canyon, located on the Arizona-Nevada border. Named the Boulder Canyon project, after the
original proposed site, the dam would not only control flooding and irrigation,
it would generate and sell hydroelectric power to recoup its costs. Still, the
proposed $165 price tag concerned some lawmakers, while representatives of six
of the seven states in the river drainage area—Colorado, Wyoming, Utah, New Mexico, Arizona and Nevada —worried that the water would primarily
go to California.
Secretary
of Commerce Herbert Hoover brokered the 1922 Colorado River Compact to divide
the water proportionally among the seven states, but the legal wrangling
continued until outgoing President Calvin Coolidge authorized
the Boulder Canyon Project in December 1928. In honor of the new president’s
contributions, Secretary of the Interior Ray L. Wilbur announced the structure
would be called Hoover Dam at a 1930 dedication ceremony, though the name
didn’t become official until 1947.
As the
Great Depression unfolded, hopeful laborers descended on Las Vegas and set up camp in the surrounding desert for the
chance to work on the project. Those who were hired eventually moved to Boulder
City, a community specifically built six miles from the work site to house its
employees. Meanwhile, the U.S. government set about finding a contractor to
build the proposed 60-story arch dam. The contract was awarded in March 1931 to
Six Companies, a group of construction firms that had pooled its resources to
meet the steep $5 million performance bond.
The first
difficult step of construction involved blasting the canyon walls to create
four diversion tunnels for the water. Facing strict time deadlines, workers
toiled in 140-degree tunnels choked with carbon monoxide and dust, conditions
that prompted a six-day strike in August 1931. When two of the tunnels were
complete, the excavated rock was used to form a temporary coffer dam that
successfully rechanneled the river’s path in November 1932.
The
second step of involved the clearing of the walls that would contain the dam.
Suspended from heights of up to 800 feet above the canyon floor, high scalers
wielded 44-pound jackhammers and metal poles to knock loose material, a
treacherous task that resulted in casualties from falling workers, equipment
and rocks.
Meanwhile,
the dried riverbed allowed for construction to begin on the power plant, four
intake towers and the dam itself. Cement was mixed onsite and hoisted across
the canyon on one of five 20-ton cableways, a fresh bucket capable of reaching
the crews below every 78 seconds. Offsetting the heat generated by cooling
concrete, nearly 600 miles of pipe loops were embedded to circulate water
through the poured blocks, with workers continually spraying the concrete to
keep it moist.
As the
dam rose, block by block, from the canyon floor, the visual renderings of
architect Gordon Kaufmann took form. Electing to emphasize the imposing mass of
the structure, Kaufmann kept the smooth, curved face free of adornment. The
powerplant was given a futuristic touch with horizontal aluminum fins for
windows, while its interior was designed to pay homage to Native American
cultures.
With the
body of water that would become Lake Mead already beginning to swell behind the
dam, the final block of concrete was poured and topped off at 726 feet above
the canyon floor in 1935. On September 30, a crowd of 20,000 people watched
President Franklin Roosevelt commemorate the magnificent structure’s
completion. Approximately 5 million barrels of cement and 45 million pounds of
reinforcement steel had gone into what was then the tallest dam in the world,
its 6.6 million tons of concrete enough to pave a road from San Francisco to New York City. Altogether, some 21,000 workers contributed
to its construction.
Hoover
Dam fulfilled the goal of disseminating the one-wild Colorado River through the
parched Southwest landscape, fuelling the development of such major cities as
Los Angeles, Las Vegas and Phoenix. Capable of irrigating 2 million acres, its
17 turbines generate enough electricity to power 1.3 million homes. The dam was
designated a National Historic Landmark in 1985 and one of America’s Seven
Modern Civil Engineering Wonders in 1994. It receives some 7 million visitors
annually, while Lake Mead, the world’s largest reservoir, hosts another 10
million as a popular recreation area.
Clancy's comment: We have built massive things like this in Australia, but not for a while. Sadly, our politicians lack vision.
I'm ...
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