Sir John Fowler and Sir Benjamin Baker designed the Forth Railway Bridge in North Queensferry, Scotland, completed in 1890. It is 8,094 ft long and stands 361 ft above the water. It was the world’s longest single cantilever bridge span until 1917.
The structure has two main spans of 680 ft, and 15 smaller spans of 168 ft, with a central 350 ft span truss. The structure comes together in three parts, with four legs of each tower sitting on a granite pier in the deep mud. The heavy stone structures on either end pin down the centilevered weight of the steel.
The Queesferry Crossing bridge is currently under construction and is due to be completed in 2016. It will be the longest three-tower, cable-stayed bridge in the world, at 1.7 miles.
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