Trambrücke, Cable-stayed bridge in Diepoldsau, Switzerland.

The Trambrücke is a cable-stayed bridge made of prestressed concrete that crosses the Rhine near Diepoldsau, featuring two pylons with steel cables supporting the roadway below. The structure connects Swiss and Austrian banks and serves as a key passage point for regional traffic.

The bridge was completed in 1985 and replaced an older connection between communities on both sides of the Rhine. It was built to improve cross-border access and meet the growing mobility needs of the region.

Locals call it Trambrücke because the Heerbrugg–Diepoldsau electric tram crossed the earlier steel truss bridge from 12 October 1915 until a bus line replaced it on 3 March 1956. The name stayed with the 1985 cable-stayed replacement, which was inaugurated with a village festival on 30/31 August and 1 September 1985.

The bridge is open to cars, cyclists, and pedestrians and allows safe crossing year-round. Located at the border, travelers should be familiar with customs regulations.

The deck does not rest on the lower crossbeam of the pylons: it hangs as a floating deck on 56 stay cables, seven per pylon side. The 14.5 m wide deck is a prestressed concrete slab 0.55 m thick at the centreline, thinning to 0.36 m at the edges, a profile hidden from outside by the concrete walls of the walkways.