Trisanna Bridge, Steel arch bridge in Tyrol, Austria.

Trisanna Bridge is a steel arch bridge that spans the Trisanna River and connects the municipalities of Tobadill and Strengen. It crosses about 86 meters above the Trisanna gorge and carries the Arlberg railway line.

The bridge was built in 1884 and was the longest steel arch structure in the world at that time. Over the decades it was reinforced multiple times and was completely rebuilt in 1964.

The bridge shows Austrian engineering skill and stands near Wiesberg Castle, serving as a vital crossing for people and goods moving through the Alpine region.

The bridge is visible from the train and can be observed from the railway platforms in Tobadill and Strengen. The best viewing point is from the road running through the valley, which offers a clear view of the structure.

The 1964 replacement was driven by high track fees for trains diverted over DB lines: the old span was pushed onto the south side of the 1,360-tonne auxiliary scaffold and cut up there, and even removing the obstructing fish-belly girder was skipped because it would have cost ten extra hours of closure. The whole 1,600-tonne sliding operation drew attention far beyond Austria.