The Great Lakes St. Lawrence Seaway System is a deep draft waterway extending 3,700 km (2,340 miles) from the Atlantic Ocean to the head of the Great Lakes, in the heart of North America. The St. Lawrence Seaway portion of the System extends from Montreal to mid-Lake Erie. Ranked as one of the outstanding engineering feats of the twentieth century, the St. Lawrence Seaway includes 13 Canadian and 2 U.S. locks.
The 2019 navigation season marks the St. Lawrence Seaway’s 60th anniversary, which opened to navigation in 1959.