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 of cascading ponds with a depth of 6 and a half feet. Early experiments with steam were started in 1780s on the Rhone River in France, and were perfected with Fulton's boat on the Seine in 1803. The British had the early lead with steam, from James Watt, William Symington, and Henry Bell, and thus it became logical that the technology transfer would migrate across the English Channel. The "Rob Roy" did such a task in 1816, while the "Aaron Maltby" left London and sailed up the Seine to Paris in 1822. A charter was issued for a tourist day