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
Elk River Chain of Lakes Watershed the stream becomes the Grass River, winding for some through the scenic Grass River Natural Area before emptying into Clam Lake. Clam Lake in turn empties directly into Torch Lake. At over in size, Torch Lake is the largest body of water in the system. The waterway, now clarified after traversing the immense depths of the lake, continues south through the Torch River, joins with the Rapid River, a major tributary, and empties into Lake Skegemog, a lake that is studded with large stump fields, the result of the flooding of timberlands when the lake level was raised several feet