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U.S. Army Corps of Engineers Vessel Yard : ウィキペディア英語版 | U.S. Army Corps of Engineers Vessel Yard
The U.S. Army Corps of Engineers Vessel Yard in the U.S. city of Duluth was constructed between Lake Superior and Duluth's harbor, midway between Duluth and Superior, Wisconsin. ==History== After the construction of the St. Mary's Falls Ship Canal was completed at Sault Ste. Marie, ships carrying grain, lumber, coal, and iron ore could carry the natural resources of the Midwest to East Coast ports. By the late 19th century the United States Army Corps of Engineers was tasked to create a bustling harbor at the western end of Lake Superior. For several years they created breakwaters, dredged channels, and built docks to accommodate ever-larger cargo-hauling ships. By the turn of the century, the Vermilion and Mesabi Iron Ranges were producing nearly 8 million long tons (8,100,000 Mg) of ore per year. The Corps was busy—between 1897 and 1902 they dredged 22 million cubic yards (17,000,000 cubic metres) out of the Duluth and Superior harbors, creating a harbor with of ship channels. By 1906, the quantity of material shipped through the harbors was dominated only that of New York and Philadelphia.
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