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View Diary: The Golden Gate Bridge At 75 (97 comments)

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  •  wasn't it damaged in the earthquake (1+ / 0-)
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    in the 80's? I recall the quake as I was watching the world series on tv and Al Michaels said we just had an earthquake. I seem to recall a section of the upper deck falling on the lower deck and some fatalities when some vehichles drove into the chasm.
    I'm going by memory so I'm sure someone can tell the story more factually and completely.

    Apologies if this was mentioned here unbeknownst to me.

    music- the universal language

    by daveygodigaditch on Sun May 27, 2012 at 07:30:43 PM PDT

    •  No.... (4+ / 0-)

      It was undamaged by the 1989 Loma Prieta earthquake. You're thinking of the Cypress Street Viaduct, whose upper tier collapsed onto the cars on the lower tier.

      During the evening commute on October 17, 1989, the Loma Prieta Earthquake jarred the Bay Area with a force measuring 7.1 on the Richter scale. The Golden Gate Bridge withstood, undamaged, the most devastating quake to strike the Bay Area since 1906. During this time of myriad traffic problems, extra bus and ferry trips were added to help smooth the commute as a flood of 30,000 to 40,000 drivers were diverted from the East Bay to Highway 101 and the Golden Gate Bridge due to the failure of the San Francisco/Oakland Bay Bridge. On October 27, 1989, an all-time record of 162,414 vehicles crossed the Bridge north and southbound.
      Since then, the Golden Gate Bridge has been undergoing a significant seismic retrofit that is supposed to theoretically allow the bridge to withstand an 8.3 earthquake, with minimal damage.
      Approximately $400 million has been spent reinforcing the bridge since 1997, and another $200 million still needs to be secured to finish the final phase, which should begin within two years and wrap up between 2016 and 2018.

      By those metrics, the 20-year, $660 million project surpasses even the original construction, which required only four years and $35 million ($564 million in today’s dollars).

      The Golden Gate Bridge, Highway and Transportation District set out to retrofit the span in response to the 6.9-magnitude Loma Prieta earthquake of 1989, which collapsed a section of the upper deck of the Bay Bridge, yet left the Golden Gate Bridge unharmed.

      •  The Cypress Viaduct (0+ / 0-)

        was part of a land-based highway in the east bay. That's the structure that pancaked so horribly. Your blockquotes are about the Bay Bridge. :-)

        Fry, don't be a hero! It's not covered by our health plan!

        by elfling on Sun May 27, 2012 at 10:31:49 PM PDT

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        •  The Question Was About..... (0+ / 0-)

          ...An "upper deck falling on the lower deck and some fatalities," which to me sounded more like he/she was thinking of what happened at the Cypress Viaduct than the Bay Bridge (42 deaths versus 1).

          The purpose of the first blockquote was me trying to explain the condition of the Golden Gate Bridge during and after the earthquake, than talk about either the Cypress Viaduct or the Bay Bridge. :-)

    •  That was the Bay Bridge (2+ / 0-)
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      Rimjob, daveygodigaditch

      Which is currently getting a complete rebuild of its east span and is meant to be a serious seismic upgrade.

      The Bay Bridge was supported by pilings that were sitting directly on bay mud, making it very vulnerable to shaking.

      The Golden Gate is anchored in rock - has to be to withstand fierce currents and winds in the deepest section of the bay. It has had seismic upgrades as well.

      Fry, don't be a hero! It's not covered by our health plan!

      by elfling on Sun May 27, 2012 at 10:29:11 PM PDT

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      •  thanks (0+ / 0-)

        I think in my mind I heard "bay" bridge and not being familiar with SF leaped to the thought that since the GG went across the bay that it was one and the same. It's all much clearer to me now with the googlemaps.
        I do remember the images of the squashed cars under the viaduct.

        music- the universal language

        by daveygodigaditch on Mon May 28, 2012 at 03:10:57 AM PDT

        [ Parent ]

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