December 11, 2008

cable cross-section


click photo for full-size image
photo by Donald Kinney

I was going to turn this into a guessing-game, but for a few of you "locals" it's probably obvious that this is a cross-section of a Golden Gate Bridge cable.

As much as the Golden Gate was a portal for immigrants, it also formed an impediment to overland travel within the region.   From the late 1800's through the 1930's, towns to the north in Marin County were reached by ferry.   Urban growth, overcrowded ferries, and automobile use led civic leaderes to propose bridging San Francisco Bay as early as 1916.

After four years of construction, the Golden Gate Bridge was completed in 1937.   Bridging the Golden Gate was one of the greatest engineering efforts of the century, and it acted as a social and economic catalyst that forever changed the San Francisco Bay region.   Today over 40 million vehicles cross the bridge each year.

Selected statistics:
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Total length of bridge, including approaches:       8,981 ft.
Length of main span portion of suspended structure:       4,200 ft.
Width of bridge:       90 ft.
Clearance above water (mean high water):       220 ft.
Height of towers above water:       746 ft.
Height of towers above roadway:       500 ft.
Diameter of main cables, including wrapping:       36-3/8 in.
Length of one cable:     7,630 ft.
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5 comments:

Louise said...

My guess is mostly only locals would have guessed. It wouldn't have even crossed my mind.

Tomate Farcie said...

It actually didn't even cross my mind either, but now that you mention it...

And about tomorrow's picture... WOW!!!

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Katney said...

I would have had no clue.

You might find a post I did last August interesting. some old family photos...

 
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