First Welland Canal 1818, when the flow was especially low, Merritt pursued the idea of bringing water to his mills from the Welland River. On a bigger scale, the Erie Canal, dug from the Hudson River through northern New York, was about to reach Lake Erie. The impending completion meant the cargo from upper Great Lakes was about to head down the canal and Hudson River to New York City, bypassing its previous destination, Montreal. At the time, a considerable rivalry existed between Montreal and New York for cargo headed to Europe via ocean-going vessels. All of these factors contributed to the construction
Great Lakes Waterway lake freighters to travel from the system's saltwater outlet to its far interior. The Waterway has larger locks and deeper drafts than the lower Seaway, limiting large freighters to the four lakes upstream of the Welland Canal and Lake Ontario and similarly restricting passage beyond the canal by larger ocean vessels. The two waterways are often jointly and simply referred to as the "St. Lawrence Seaway", since the Great Lakes, together with the St. Lawrence River, comprise a single navigable body of freshwater linking the Atlantic Ocean to the continental interior. Shipping channels separate upbound traffic from downbound traffic. The