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The seaway's opening increased trade and production in several Ohio cities. Ashtabula, Cleveland, and Toledo experienced growth. Unfortunately, the long-term economic benefits of the Great Lakes St. Lawrence Seaway System have not met initial expectations. Due to ice forming on the waterway during winter months, the seaway remains open, on average, 260 days per year. The size of the canals also prohibits larger ships from using the watercourse. In 1979, the Great Lakes St. Lawrence Seaway System experienced its greatest use, with more than eighty million tons of products traveling along the seaway. In the waterway's first thirty years of existence, 160,000 ships from fifty different nations traversed the route. The Great Lakes St. Lawrence Seaway System remains operation today, although in 2004 it became known as HwyH2O.
[[Category:The Cold War and Civil Rights]]