The term Seawaymax refers to vessels which are the maximum size that can fit through the canal locks of the St Lawrence Seaway. Seawaymax vessels are 740 feet in length, 78 feet wide, (maximum 226 m length, 24 m beam) and have a draft of 26 feet. A number of Lake freighters larger than this size cruise the Great Lakes and cannot pass through to the Atlantic Ocean. Most new vessels are constructed to this size limit to enhance versatility. Canal locks in England. ... The Saint Lawrence Seaway in its broadest sense (see Great Lakes Waterway) is the system of canals that permits ocean-going vessels to travel from the Atlantic Ocean to the Great Lakes as far as Lake Superior. ... The cargo vessels that work the Great Lakes are known as Lake freighters or Lakers. ... The Great Lakes from space The Great Lakes are a group of five large lakes on or near the United States-Canadian border. ...
Ships classified as Panamax are of the maximum dimensions that will fit through the locks of the Panama Canal, each of which is 1000 ft long by 110 ft wide and 85 ft deep. ...
The R.J. Hackett premiered the style and the second Algosoo was the final vessel designed this way.
More recently built lakers, like the Seawaymax CSL Niagara, have a single large superstructure island right astern.
Since the freshwater lakes are less damaging then the salt water of the oceans, many of the Lakers remain in service for long periods and the fleet has a much higher average age than the ocean-going fleet.
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