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 manure, litter and rubble were removed from town. The Quais at Bersy, Rapee, Hotel de Ville and Louvre carried on trade. And by 1880, the trade was duty-free from tariffs. The Canal de l'Ourcq was constructed in 1808 between the River Ourcq and the Seine. Its purpose was to provide Paris with drinking water and a new navigable waterway. Geometricians at heart, the engineers of the Empire dug the canal along the axis of the Rotunda. With the industrial revolution along came mechanical workshops and boiler-works, replacing the countryside. Warehouses sprang up along the banks as 10,000 barges delivered to