The canals at Farran's Point, Rapide Plat, and Galops were known collectively as the Williamsburg Canals. Built between 1844 and 1856 on the north side of the St. Lawrence as part of the Great Lakes navigation system, they included the three-quarters-mile Farran's Point Canal with a single lock, the four-mile Rapide Plat Canal with two locks, and the Galops and Iroquois canals, together known as the Galops Canal, which extended seven and five-eighths miles and had three locks. Ascending vessels used all three canals, while descending vessels used only the Galops. The canals disappeared with the construction of the St. Lawrence Seaway in 1959.