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Creeping closer inch by inch - 900 ft above the mighty Colorado River - the two sides of a $160 million bridge at the Hoover Dam in America 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 ft 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 ft across. At the moment, the structure looks like a traditional suspension bridge, but the long cables are just temporary. 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.
 

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I thought that Teesside's transporter bridge got put there a few years back, sure I watched something on t.v. about it.:S
 

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We was out there when they was starting the pillers in the rock faces! They had like a cable car set up to get to the rock face on either side!
God knows how those guys can work in it, it was cooking out there!
They got that walk of faith thing now as well, A glass bridge!!!

Cheers Rich
 

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They were working on that when i was there 3 years ago, taking there time 8)

Those pics dont do it justice. When you stand on the dam and look down the trucks seem like toys. The scale of the place is overwhelming.
 
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