Felsenauviadukt, Prestressed concrete bridge in Felsenau, Bern, Switzerland.

The Felsenauviaduct is a concrete bridge crossing the Aare River near Bern that connects two parts of the city as part of Autobahn A1. The structure features a box girder design supported by distinctive piers that rise visibly above the river landscape.

Built between 1972 and 1974 and opened on 4 September 1975, the viaduct cost around 27 million Swiss francs. It was designed by engineer Christian Menn as a prestressed concrete box girder, with the four main spans of 144 m erected by free cantilevering. In 2010 and 2011 it was renovated with new edge walls, waterproofing and road surfacing.

The viaduct's name comes from the Felsenau district it crosses; literature usually calls it Felsenaubrücke Bern. During construction it served as a film set for the 1975 adaptation of Dürrenmatt's novel Der Richter und sein Henker, with Kommissär Bärlach chasing Tschanz across the unfinished deck. Since 2024 a public climbing wall has been built on two of its piers, funded largely by the Bern section of the Swiss Alpine Club.

The viaduct is visible from the riverbank and nearby streets, offering different views depending on where you stand. Visitors should note that this is an active traffic route and it is best appreciated from safe vantage points.

The design uses unusually long spans between supports, which was a technical achievement for its time. This solution allowed crossing the river with fewer obstacles than conventional designs would require.