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
Tuscarora Creek (Monocacy River) bridge service, operated by the Walkersville Southern RR. The original plan for the railroad called for it to cross the Monocacy river below Tuscarora Creek and therefore no bridge was located by Gitt in 1867. The finalized location for the railroad called for a bridge over Tuscarora Creek approximately 300 feet south of the Monocacy river crossing for the road. Like the other bridges on the road, the Tuscarora Creek bridge was to be a "Bollman suspension truss" with a creek span of 63 feet, 10 feet above water. In 1872, Bollman's firm, Patapsco Bridge and Iron Works completed the bridge.