Why is the Golden Gate Bridge so stable?

The forces carried down through the steel towers are resisted by the strength of the concrete foundations, which extend into bedrock. The pulling or tension forces in the cables are resisted by the massive concrete anchorages at both ends of the Bridge, and those anchorages are also embedded in bedrock.



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According to the book The World Without Us by Alan Weisman, suspension and truss bridges would collapse after two or three centuries without maintenance. The cause would be rust eventually filling the expansion joints, causing damage during hot weather.

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The weight of the roadway is hung from 250 pairs of vertical suspender ropes, which are attached to two main cables. The main cables pass over the two main towers and are fixed in concrete at each end. Each cable is made of 27,572 strands of wire.

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Approach spans that lead to the suspension bridge at its north and south ends have been seismically retrofitted with seismic isolation bearings, which function like shock absorbers to reduce the intensity of earthquake shaking experienced by the structure.

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Despite the terrifying image of a 250-foot wave about to wash over the Golden Gate Bridge, tsunamis do not actually pose a considerable threat to the Bay Area. Bay Curious is a podcast that answers your questions about the Bay Area.

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Swaying in the wind The Golden Gate Bridge takes about 20 seconds to complete one back-and-forth swing.

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5 Fun Facts About the Golden Gate Bridge
  • The bridge is actually not golden at all! It's a bright red-orange.
  • It was named one of the Seven Wonders of the Modern World.
  • It took four years to build.
  • There are approximately 600,000 rivets in each of the bridge's towers.
  • It's the most photographed bridge in the world.


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The Golden Gate Bridge is closely monitored to make sure it does not exceed its stress limits due to traffic, wind and seismic loads. We can look forward to at least another 80 years of this engineering masterpiece. (Top image: Courtesy Getty Images.)

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The Golden Gate Bridge, Highway and Transportation District is a special-purpose district that owns and operates three regional transportation assets in the San Francisco Bay Area: the iconic Golden Gate Bridge, the Golden Gate Ferry system and the Golden Gate Transit system.

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Want to swim over the deepest part of the bay? Maybe you've already done it and had no idea - you'll find the deepest water in our Golden Gate Bridge race just under the bridge at over 370 feet.

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Given the GGB's dimensions, about 1,200 passenger cars can fit on the bridge at once. Crunching some numbers: This means that almost three million tons of weight could be pushed down on the bridge's suspension during rush hour.

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What is a weakness of the Golden Gate Bridge? They can be unstable in extremely turbulent conditions, requiring temporary closure of the bridge. Suspension bridges are built to move, and high wind can cause damage to the bridge.

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The deck of the bridge is about 245 feet (75 m) above the water. After a fall of four seconds, jumpers hit the water at around 75 mph (120 km/h). Most of the jumpers die due to impact trauma. About 5% of the jumpers survive the initial impact but generally drown or die of hypothermia in the cold water.

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2. The Golden Gate Bridge's signature color was not intended to be permanent. The steel that arrived in San Francisco to build the Golden Gate Bridge was coated in a burnt red and orange shade of primer to protect it from corrosive elements.

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