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The Long Sault created a navigation barrier along the river for much of its history, necessitating the construction of the Moses-Saunders Power Dam, part of the St. Lawrence Seaway, in the 1950s as the size of ships and the volume of shipping traffic along the river began to exceed the capacity of the area's canal locks.
The lighthouse marking the entrance to the St. Lawrence Seaway is now a youth hostel operated by Hostelling International USA.