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
Russky Bridge name. The bridge to Russky Island is the world's longest cable-stayed bridge, with a 1104 m long central span. The bridge also has the second highest pylons after the Millau Viaduct and the longest cable stays. The design of the bridge crossing has been determined on the basis of two primary factors: The piles were driven as deep as 77 m below ground and on the island side 120 auger piles were piled under each of the two 320 m high bridge towers. The pylons were concreted using custom self-climbing forms in pours of 4.5 m. A crane was used