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THE WIDER VIEW: Taking shape, the new bridge at the Hoover Dam
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THE WIDER VIEW: Taking shape, the new bridge at the Hoover Dam
Creeping closer inch by inch, 900 feet above the mighty Colorado
River, the two sides of a $160 million bridge at the Hoover Dam slowly
take shape.
The bridge will carry a new section of US Route 93 past the
bottleneck of the old road which can be seen twisting and winding
around and across the dam itself.
When complete, it will provide a new link between the states of
Nevada and Arizona . In an incredible feat of engineering, the road
will be supported on the two massive concrete arches which jut out of
the rock face.
The arches are made up of 53 individual sections each 24 feet long
which have been cast on-site and are being lifted into place using an
improvised high-wire crane strung between temporary steel pylons.
The arches will eventually measure more than 1,000 feet across. At
the moment, the structure looks like a traditional suspension bridge.
But once the arches are complete, the suspending cables on each side
will be removed. Extra vertical columns will then be installed on the
arches to carry the road.
The bridge has become known as the Hoover Dam bypass, although it is
officially called the Mike O'Callaghan- Pat Tillman Memorial Bridge,
after a former governor of Nevada and an American Football player from
Arizona who joined the US Army and was killed in Afghanistan. Work on
the bridge started in 2005 and should finish next year. An estimated
17,000 cars and trucks will cross it every day.
The dam was started in 1931 and used enough concrete to build a road
from New York to San Francisco . The stretch of water it created, Lake
Mead , is 110 miles long and took six years to fill. The original road
was opened at the same time as the famous dam in 1936. More photos
below .
An extra note: The top of the white band of rock in Lake Mead is the
old waterline prior to the drought and development in the Las Vegas
area. It is over 100 feet above the current water level.
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