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Duluth Ship Canal
The Duluth Ship Canal is an artificial channel cut through Minnesota Point, providing direct access to Duluth harbor from Lake Superior. Begun privately in 1871, it was put under federal supervision and maintenance several years later. It is still an important component of the harbor facilities.
In its current configuration, the channel is defined by a pair of breakwaters long and apart, constructed of concrete set on timber and stone cribbing.[ HAER No. MN-10〕 The channel is maintained at wide and LWD, allowing passage of ocean-going ships. Three lighthouses are placed on the sides of the channel: the Duluth North Pier Light and the Duluth South Breakwater Outer Light mark the lake ends of the channel, while the Duluth South Breakwater Inner Light functions with the south breakwater light as a range light. At the harbor end, the channel is straddled by the Aerial Lift Bridge which connects Minnesota Point to the rest of the city. On the north side, there is a building housing the local Corps of Engineers administration, as well as the Lake Superior Maritime Visitor Center. There are no locks; most ships transit the channel under their own power, though tug service is available in case of adverse weather. Around a thousand vessels a year ship from the Duluth–Superior port.〔(【引用サイトリンク】title=Duluth–Superior Harbor Statistics )〕]
==History==
The construction of the first locks on the St. Marys River in 1855 allowed for navigation between the lakes, and Superior Bay presented itself as an attractive harbor. From the point of view of Duluth residents, however, arrangements were less than satisfactory, as ships from that city had to pass Superior, Wisconsin on the way to the lake, as the only natural outlet was between Minnesota Point and Wisconsin Point at the far end of the bay. Also, while sheltered, the bay was not naturally as deep as was desirable, and the channel was convoluted. In 1865 a harbor was constructed outside the bay using a breakwater, and this was gradually improved over the next several years. A storm in 1871 destroyed the structure, and though it was rebuilt the next year, it was abandoned in 1878 due to ongoing ice and storm damage.〔 HAER No. MN-10〕
An 1866 report by Lt. Col. W. F. Raynolds of the Bureau of Topographical Engineers recommended cutting a channel through Minnesota Point, but due to the cost, no action was taken.〔 Instead, a massive federal effort was undertaken to improve facilities in Superior. At the same time, the city of Duluth combined forces with the Lake Superior and Mississippi Railroad to dig a channel on their own.〔 This began in 1870, and politicians in Wisconsin, seeing traffic through Superior threatened, went to the war department to have construction stopped, eventually obtaining an injunction on July 13, 1871.〔〔 They were too late. The channel was completed two months earlier, with local lore holding that on April 30, 1871, a group of city residents, summoned by brewer (soon to be mayor) Sidney Luce, came to the site with shovels and picks and dug the first connection between the bay and the lake.〔
The injunction was soon lifted, at the cost of building a dike from Rice's Point to Minnesota Point, thus isolating the canal from the main flow of the Saint Louis River, which fed the bay and which formed the border between the rival cities.〔 The dike did not last long; it suffered ice damage from the start and was gradually removed in the course of dredging.〔 Federal responsibility for the latter, a result of the 1873 River and Harbor Act, gradually expanded into jurisdiction over all facilities in the area, with the Corps of Engineers taking over the canal in 1887.〔
The canal remains under the control of the Corps of Engineers to the present. In 1889, however, an attempt was made by Wilhelm Boeing, a Detroit businessman, to charge tolls for use of the canal. Boeing, the father of aircraft manufacturer William Boeing, owned property on both sides of the canal as well as thousands of acres of timber near Chisholm, and in 1888 his attorney had a string stretched across the entry to the canal to claim the right to charge tolls. This came to nothing, but the following October, flyers were distributed to shipping offices stating that a rope would be stretched across the canal on the fifteenth of the month to deny passage to all vessels. It is unclear what Boeing's intentions were, or whether he carried out his threat; but in any case his death the next month ended the matter.
The canal was, from the beginning, defined by piers along either side. These were initially timber cribs put in place by the city, albeit with some federal funding. They did not stand up to the harsh winter weather and required substantial maintenance every few years, up until an 1896 project to rebuild the canal.〔 It was this project that gave the two piers their present form, with the new south pier completed in 1901, and the north pier completed the following year.〔 In 1906 the present administration building was completed; this was enlarged in the 1940s, and a visitor's center and museum was added to that in 1973.〔 A maintenance yard was constructed on the south side of the canal. The famous bridge was constructed in 1905 to provide access to Minnesota Point, which was cut off from the mainland by construction of the canal.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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