The Wiesen Viaduct is a single track limestone railway viaduct. It spans the Landwasser River southwest of the hamlet of Wiesen, in the Canton of Graubünden, Switzerland.Designed by the then chief engineer of the Rhaetian Railway, Henning Friedrich, it was built between 1906 and 1909 under the supervision of another engineer, Hans Studer. The Rhaetian Railway still owns and uses it today.An important element of the Davos–Filisur railway, the viaduct is high, long, and has a main span of.LocationThe Wiesen Viaduct forms part of the Davos–Filisur railway section between Wiesen and Filisur. Just southwest of Wiesen railway station, it has, on its south side, a separate pedestrian bridge giving hikers access to Filisur. At the western end of the viaduct is a non functioning Hippsche turning wheel.HistoryThe Wiesen Viaduct structure was designed by the then Chief Engineer of the Rhaetian Railway, Henning Friedrich. Construction began in October 1906, under the direction of another engineer, Hans Studer. With the launch of the Davos–Filisur railway in July 1909, the viaduct came into operation. It cost a total of 324,000 Swiss francs to build.