Ganter Bridge is a reinforced concrete road bridge which is the longest spanning bridge in Switzerland, located along the Simplon Pass road in the canton of Valais about 10 km south of Brig. It was designed by renowned Swiss civil engineer Christian Menn and completed in 1980. The overall length is 678 m with a main span of 174 m, and a maximum tower height of 150 m.
The bridge’s form consists of an S-curve high above the Ganter River, at an elevation of about 1,450 m above sea level. Two main towers and five smaller piers support a total of eight spans with lengths of 35 m, 50 m, 80 m, 127 m, 174 m, 127 m , 50 m , and 35 m. The longest span between the two towers is straight, while the remaining spans lie along curves with a radius of 200 m.
Its unique design, combining elements of a cable-stayed bridge and a prestressed cantilever hollow-box girder bridge, with triangular concrete walls above the roadway which contain the prestressed cable-stays, has been awarded many prizes. This hybrid type of cable-stayed and girder bridge is sometimes referred to as an extradosed bridge.
- The bridge is 678 meters long , with a main span of 174 meters. The tallest pier is 150 meters high.
- The central span is straight while the sides spans are curved.
- The piers flare outward above road deck to give an added sense of substance and solidity.