The Landwasser Viaduct is a single track six-arched curved limestone railway viaduct. It spans the Landwasser River between Schmitten and Filisur, in the Canton of Graubünden, Switzerland.Designed by Alexander Acatos, it was built between 1901 and 1902 by Müller & Zeerleder for the Rhaetian Railway, which still owns and uses it today. A signature structure of the World Heritage-listed Albula Railway, it is high, long, and one of its ramps exits straight into the Landwasser Tunnel.DescriptionThe Landwasser Viaduct has six arch spans in width, resting on five high pillars. The railway line near the viaduct has a slope of 2 percent, and in plan a circular arc with a radius of.The southeastern abutment of the viaduct is located on a high cliff, and at that point, the tracks lead directly into the long Landwasser Tunnel.The viaduct's masonry is approximately in volume and is jointed with dolomitic limestone.LocationThe dark limestone-built viaduct forms part of the Albula Railway section between Tiefencastel and Filisur, and is at the mark from Thusis.