Bay Bridge, from Below, San Francisco

[likalar]

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M9, 50mm Summicron..... This 1939 Charles Purcell designed bridge is 4.5 miles long and 57 (5 traffic lanes) wide. It was opened a few months before the more famous Golden Gate Bridge.

 

Larry

[pauledell]

Larry,

 

Great perspective and viewpoint along with the sharpness, tones and details.

 

Paul

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[stuny]

Larry -

 

I agree. It's a beautiful shot.

[daveleo]

Larry,

glad you caught all the details in the shadows, even shooting against the sky.

 

that box-truss under the roadway looks mighty stiff . . . wonder if that was an add-on to the original design ?

[likalar]

Thanks! Glad you like the photo! Dave, The lower level was originally engineered for 3 lanes of trucks, and 2 tracks for commuter rail trains. Years later, the upper level was devoted to westbound cars and trucks, the lower level became 5 lanes of eastbound traffic, after the tracks were removed. I believe the box trusses are original, considering the train/truck usage, but can't find photos of them in the historical sites.

 

Larry

 

edit:

Dave, I'm wrong. Much of it has been rebuilt. Here's info an engineer will appreciate. Scroll down a bit to the retrofitting section.

http://en.wikipedia.org/wiki/San_Francisco_–_Oakland_Bay_Bridge

Edited October 1, 2010 by likalar