Tarn (river) a mean flow of approximately . The Millau Viaduct spans the valley of the Tarn near Millau, and is now one of the area's most popular attractions. The tributaries of the Tarn include: The Tarn separates the Narbonne and Aquitaine basins. The Tarn passes through the following departments and towns: The Millau Viaduct, the tallest bridge in the world, carrying the A75 autoroute across the Tarn Gorge near Millau, opened in December 2004. The Tarn is famous for its brutal floodings, which are the most dangerous in Europe along with the Danube. The flooding of March 1930 saw the Tarn
Stone Bridge and the Oregon Central Military Wagon Road Register of Historic Places on 8 November 1974. Despite this designation, both are very difficult to find. A marker was placed at the east end of the Stone Bridge in 1975; however, the causeway itself is only visible when the water level in the adjoining lakes drops to a low level. Some sections of the military road have become part of Oregon's modern road network while crude dirt roads follow the route in other places; however, most of the original road has completely disappeared. Stone Bridge and the Oregon Central Military Wagon Road The Stone Bridge is a causeway built