The course of the river was corrected between Rouen and Paris in the 19th century. There are seven locks. Barges with merchanise, of a capacity of up to 350 t can circulate. The dimension of the lock determines the maximum dimension of the ship. When most canals were built in France, the mister for public works, Charles de Freycinet determined the maximum length of the locks. As a result, the maximum dimension of the ship are by , with a draft of . In the case of the French canals, the maximum draft is . The load of a peniche is about that of ten lorries or eight rail waggons. Other ship types that can circulate have a capacity of to . Convois of barges with a length between to and can transport betweeen and of freight. Other ships include river-vessels that can transport up to of freight.