Seine Commercial craft (barges and push-tows) can use the river from Marcilly-sur-Seine, to its mouth. At Paris, there are 37 bridges. The river is only above sea level from its mouth, making it slow flowing and thus easily navigable. The Seine Maritime, from the English Channel at Le Havre to Rouen, is the only portion of the Seine used by ocean-going craft. The tidal section of the Seine Maritime is followed by a canalized section ("Basse Seine") with four large multiple locks until the mouth of the Oise at Conflans-Sainte-Honorine (170 km). Smaller locks at Bougival and at Suresnes lift the
Seine River Steamers was then transferred to la Dorade 3 at Val-de-la-Haye, near Rouen, to be carried up the Seine, on whose banks people had gathered to pay homage to Napoleon. On 14 December la Dorade moored at the Courbevoie quay. He was then ceremonially re-interred at Les Invalides. With Baron Haussmann's levelling of the centre of Paris and building the sewers and Boulevards, the river bank was also reconstructed the famous Quais on the Seine banks were erected. The river provided the key to moving in building materials: timber, sand, bricks, stone, gravel and ironware were moved; wine, fruit, and hay; while