The Soo Locks and Welland Canal close from mid-January to late March, when most boats are laid up for maintenance. Because of winter ice on the lakes, the navigation season is not usually year-round.
The 63 commercial ports handled 173 million tons (157 teragrams) of cargo in 2006. Since the late 19th century, lakers have carried bulk cargoes of materials such as limestone, iron ore, grain, coal, or salt from the mines and fields of the upper Great Lakes to the populous industrial areas farther east. These vessels are traditionally called boats, although classified as ships. Lake freighters, or lakers, are bulk carrier vessels that operate on the Great Lakes of North America.
Anderson, with pilothouse forward and engine room astern, also equipped with a self-unloading boom.
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