Written by The Bridge Lady (Regina)

Bridge Focus: Golden Gate Bridge

The Golden Gate Bridge is, undeniably, one of the best known bridges in the world. Spanning the Golden Gate Strait, a channel that connects San Francisco Bay to the Pacific Ocean, it has been named one of the Wonders of the Modern World by the American Society of Civil Engineers. This is really no surprise, as the Golden Gate Bridge has now become a globally recognized symbol for San Francisco and the state of California and is a must-see for tourists.

Prior to the bridge being built, the shortest and most practical way to cross the Golden Gate Strait was by boat. As a result, a ferry service was started, which ran from as early as 1820. However, many wanted to build a bridge to connect San Francisco to Marin County. As the city of San Francisco was still largely serviced by boats and ferries, its connection to other cities around the bay was hampered and, as such, its growth was slower than other large American cities of the time.

A bridge proposal was put forth in 1916 by James Wilkins, a former engineering student. However, the city’s chief engineer valued the design at $100 million, which was drastically impractical at the time. A call was put out to bridge engineers to see if it could be done in a more cost-effective manner. Joseph Strauss, an ambitious structural engineer, responded and drew up an initial design, which he said could be completed at the more moderate cost of $17 million. The project was approved by local authorities, provided that the inexperienced Strauss would accept advice from several consulting project experts. A suspension bridge design was chosen as the most practical, due to recent advances in metallurgy.

The project faced opposition from many angles; there were concerns the bridge would interfere with ship traffic, or that it would provide major competition to the existing ferry service. However, there were also allies, such as the ever-growing automobile industry, which encouraged the construction of roads and bridges to increase the need for cars. Despite opposition and funding issues, construction eventually began in 1933 and was completed in 1937, ahead of time and $1.3 million under budget. At 4200 feet long, the Golden Gate Bridge remained the longest suspension bridge in the world for almost thirty years, until 1964 when the Verrazano-Narrows Bridge in New York City was completed.

Though Strauss was the chief engineer of the project and was in charge of the overall design and construction, his lack of experience in cable-suspension designs meant that other experts in engineering and architecture were called in. The final structural suspension design can be attributed to Leon Moisseiff, the architect of the Manhattan Bridge, who introduced his “deflection theory” to reduce stress on the bridge towers by allowing the roadway to flex in the wind. An unknown residential architect called Irving Morrow designed the the shape of the bridge towers, the lighting, and other elements, while the principal engineer was Charles Alton Ellis, who did much of the technical and theoretical work that built the bridge, but received none of the credit in his lifetime. Strauss, wanting to take all of the credit, greatly downplayed the contributions of his collaborators and it wasn’t until much later that the contributions of the others on the design team were properly recognized.

Keep checking back to our blog for many more bridge features! Do you have a favourite bridge in the world? Please post your thoughts or photos in the comments below. If you are looking for help to design and install a bridge on your property, don’t hesitate to contact our experienced team today.