Monday, July 18, 2011

A Bridge In Need

“What need the bridge much broader than the flood?”
William Shakespeare 1564-1616

Because of damage done in the 1989 earthquake, what the San Francisco Oakland Bay Bridge needs is a good seismic retrofit. It turned out that it costs less and is more efficient to build a new bridge than to retrofit the old one. It’s taking a looooong time to build but when the bridge is done it will be the world’s largest single tower self anchored suspension span. It will have only one main cable that will anchor into the east end of its own deck. The cable then will rise up to the tower and then wrap around the west end of the bridge holding itself in place.

The current Bay Bridge is on the left.

The answer to the mystery in the last post- it's a cross section of the main cable (made up of the many colored smaller cables) that will hold this bridge together.


  1. So the old bridge will be redundant once this fabulous construction is finished? Doesn't that mean the San Francisco skyline is altered in a big way?

    A cross-section! Wouldn't have guessed in a million years...

  2. the bay bridge freaks me out (current one, that is). cannot wait for the new one! great mystery in the previous post!

  3. Wow! What a bridge! The simple design is amazing. (Oh how I love SF Bay!)

  4. That's very cool. I never would have guessed.

  5. amazing piece of information, really, especially since i saw the damage done in 1990, and i am occasionally wondering how they're getting on, up there... cheers!


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