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Thread: Big Pic Warning - Hoover Dam Bypass Bridge

  1. #1
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    Big Pic Warning - Hoover Dam Bypass Bridge

    Rob, here are the pics I mentioned in the Tour de Wood thread. This is from an e-mail that's been forwarded around multiple times around engineering offices, so I don't know who to credit for the pics or the text. I got it from my dad the civil engineer.



    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.

    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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  2. #2
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    As amasing as that thing is in the pictures, it's even more amasing when you see it for real. I drove through there last June.
    "There’s a lot of work being done today that doesn’t have any soul in it. The technique may be the utmost perfection, yet it is lifeless. It doesn’t have a soul. I hope my furniture has a soul to it." - Sam Maloof
    The Pessimist complains about the wind; The Optimist expects it to change;The Realist adjusts the sails.~ William Arthur Ward

  3. #3
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    Nope, I ain't going on that bridge. Nope, I wouldn't help build that bridge. Awesome as it might be, just ain't going to happen.

  4. #4
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    Quote Originally Posted by Steve Southwood View Post
    Nope, I ain't going on that bridge. Nope, I wouldn't help build that bridge. Awesome as it might be, just ain't going to happen.

    Nope me either. You couldn't pay me to drive over it.
    Faith, Hope & Charity

  5. #5
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    I'll bet it is mighty impressive in person, Don. I found a few more pics...these were taken at the end of January 2010 after the suspension cables had been removed. I believe these were taken by Frank Kozeliski, a consulting engineer in Gallup, NM.















    I can relate to what Steve said. With my fear of heights, I wouldn't be able to work on a project like this one, although I think I'd be willing to drive on it. I'm fascinated by the process and logistics of building something like this, though.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  6. #6
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    Man, they have made ammasing progress since I saw it.
    "There’s a lot of work being done today that doesn’t have any soul in it. The technique may be the utmost perfection, yet it is lifeless. It doesn’t have a soul. I hope my furniture has a soul to it." - Sam Maloof
    The Pessimist complains about the wind; The Optimist expects it to change;The Realist adjusts the sails.~ William Arthur Ward

  7. #7
    I wonder how strong the wind are coming down the river valley, walking across the bridge might be a terror

  8. #8
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    Vaughn thats fantastic. I have been to Hoover but of course it was before this bridge started. Its a real site for sore eyes. Great feet of civil engineering. I aint no civil engineer but i would love to work on a project like this and drive over it i definitely will some day.

    It sure is gonna help the security of the Hoover Dam. I have always been worried about that one being on the "targets" list by the bad boys. Vegas needs that dam or it will die of thirst.

    When i was there once i stopped on the Arizona side and looked down there used to be a small gift.caffeteria on the side of the road just up from the dam. Walked to the edge and we could hundreds of catfish hanging about the surface of the water waiting for something to fall in the water. Seems they been attracted to things people through over the edge.

    The water was very very low that year.

    Thanks for the pictures Vaughn very interesting project.

    Thinking allowed they must have used some technology to get the concrete to set at the temps that exist around that area.

    Back in the day i know of a dam in Norther Natal (SA) where they actually built an ice making factory in order to build the dam. They floated huge blocks like icebergs in the coffer dams in order to get ambiet temps down sufficient to set the concrete with the heat and humidity that one gets in this specific area.

    I wonder how things have changed and how they dealt with that issue on this bridge with casting those blocks in locale.
    cheers

  9. #9
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    the bridge is almost as amazing as the surroundings its in.
    I hope I get to make my trip out there soon, Im very dissapointed I never was able to travel there last sept/oct as planned.

  10. #10
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    WOW! Amazing pics.
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