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
Black River (Duwamish River) of the Black and White rivers created the Duwamish River, which emptied into Elliott Bay in Puget Sound. Thus, the water of rivers emptying into Lake Washington, such as the Sammamish River, once flowed through the Black and Duwamish rivers. Today, Lake Washington's water empties into Puget Sound via the Lake Washington Ship Canal. In November 1911, the Cedar River flooded Renton. In 1912, the Cedar was diverted from the Black River into Lake Washington to avoid future floods. Its water still flowed through the Black after passing through Lake Washington. In 1916, with the opening of the Lake Washington