Bridge Title
If you can see this, then your browser cannot display the slideshow text.

Name Golden Gate Bridge San Francisco, California, USA
Owner Golden Gate Bridge & Highways District for State of California
The bridge was created through a special act of the state legislature in 1923
Design Joseph B Strauss - Chief Engineer
Consultants Leon S Moisseiff, O H Amman, Charles Derleth Jr
Contractors Main Piers: Pacific Bridge Company
Anchorages & Approach Piers: Barrett & Hilp.
Cables: John A Roebling Company
Steel: Bethlehem Steel Company
Where San Francisco
Latitude N 37 49' 11"
Longitude W 122 28' 43"
When 1937
Why US Highway 101 connects the City & County of San Francisco with Marin County
Spans the Golden Gate the opening of the San Francisco Bay to the Pacific Ocean 
What Read some more details.....
How to read a bridge Read more about suspension bridges.....

Read more about the book metaphor.....



Pictures from Robert Gregory & David Blockley, UK - September 2008 & April 2011

Overall type Hanging - Suspension Bridge. Read more about suspension bridges.....
Width 27 m. - 6 lanes traffic
Length 2,737 m.
Spans Main span: 1,280 m. Each side span: 343 m.
Clearance above high water level 67 m.
Height of tower 227 m.
Materials Steel
Cables 2 main cables: 0.92 m. diameter.
No of wires in cable: 27,572
Diameter of wire: 5 mm.
Number of strands in each cable: 61
Suspenders: 250 pairs of ropes each mm. diameter (all were replaced in 1972-76)
Retrofit programme 2001 - 2012 for seismic shock Study initiated immediately after 1989 earthquake.
Need to retrofit for earthquakes of Richter magnitude 7 or above.
Phase 1 1997-2002 - strengthening together with installing of isolator bearings, expansion joints. 4 support towers replaced during continuous traffic flow.
Phase 2 2001-2008 - replacing support towers, anchorage housing plus new shear walls, installing isolation bearings and joints, adding new steel plating, new bearings and energy dissipation devices and isolation joints.
Phase 3 2008-2012 - strengthening foundations, installing piles and rock bolts, shear walls and other structural modifications.
Appearance Famous for its red appearance officially called "international orange".
Art Deco form by architects Irving F Morrow.