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Rideau Canal : ウィキペディア英語版
Rideau Canal

The Rideau Canal, also known unofficially as the Rideau Waterway, connects the city of Ottawa, Ontario, Canada, on the Ottawa River to the city of Kingston, Ontario, on Lake Ontario. It is 202 kilometres in length. The name ''Rideau'', French for "curtain," is derived from the curtain-like appearance of the Rideau River's twin waterfalls where they join the Ottawa River. The canal system uses sections of two rivers, the Rideau and the Cataraqui, as well as several lakes. The Rideau Canal is operated by Parks Canada.
The canal was opened in 1832 as a precaution in case of war with the United States. It remains in use today primarily for pleasure boating, with most of its original structures intact, operated by Parks Canada. The locks on the system open for navigation in mid-May and close in mid-October.〔Rideau Canal, UNESCO World Heritage, (UNESCO.org ). Retrieved 2008-01-14.〕〔(【引用サイトリンク】title= Rideau Canal National Historic Site of Canada > Lockstation Safety )〕 It is the oldest continuously operated canal system in North America, and in 2007 it was registered as a UNESCO World Heritage Site.〔(UNESCO names World Heritage sites ), BBC News, 28 June 2007. Retrieved 2008-01-14.〕
==History==

The construction of the Rideau Canal was a preventive military measure undertaken after a report that during the War of 1812 the United States had intended to invade the British colony of Upper Canada via the St. Lawrence River, which would have severed the lifeline between Montreal and Kingston. The British built a number of other canals (Grenville, Chute-à-Blondeau and Carillon Canals, all along the Ottawa River) as well as a number of forts (Citadel Hill, La Citadelle, and Fort Henry) to impede and deter any future American invasions of Canadian territory.
The initial purpose of the Rideau Canal was military, as it was intended to provide a secure supply and communications route between Montreal and the British naval base in Kingston. Westward from Montreal, travel would proceed along the Ottawa River to Bytown (now Ottawa), then southwest via the canal to Kingston and out into Lake Ontario. The objective was to bypass the stretch of the St. Lawrence bordering New York; a route which would have left British supply ships vulnerable to an attack or a blockade of the St. Lawrence.
The canal also served a commercial purpose. The Rideau Canal was easier to navigate than the St. Lawrence River because of the series of rapids between Montreal and Kingston. As a result, the Rideau Canal became a busy commercial artery from Montreal to the Great Lakes. However, by 1849, the rapids of the St. Lawrence had been tamed by a series of locks, and commercial shippers were quick to switch to this more direct route.〔(【引用サイトリンク】 Parks Canada - Rideau Canal National Historic Site of Canada Receives World Heritage Site Designation! )
The construction of the canal was supervised by Lieutenant-Colonel John By of the Royal Engineers. Private contractors such as future sugar refining entrepreneur John Redpath, Thomas McKay, Robert Drummond, Thomas Phillips, Andrew White〔(History of the Rideau Canal ), Rideau-info.com. Retrieved 2008-01-14.〕 and others were responsible for much of the construction, and the majority of the actual work was done by thousands of Irish and French-Canadian labourers. Colonel John By decided to create a slackwater canal system〔(Rideau Heritage Route - Environment )〕 instead of constructing new channels. This was a better approach as it required fewer workers, was more cost efficient, and would have been easier to build.〔(Rideau Canal - UNESCO World Heritage Centre )〕
The canal work started in 1826, and it took six years to complete by 1832. The final cost of its construction was £822,000. Given the unexpected cost overruns, John By was recalled to London and was retired with no accolades or recognition for the tremendous accomplishment he'd achieved.
Once the canal was constructed, no further military engagements took place between Canada and the United States. Although the Rideau Canal never had to be used as a military supply route, it played a pivotal role in the early development of Canada. Prior to the locks being completed on the St. Lawrence in the late 1840s, the Rideau served as the main travel route for immigrants heading westward into Upper Canada and for heavy goods (timber, minerals, grain) from Canada's hinterland heading east to Montreal. Tens of thousands of British immigrants travelled the Rideau in this period. Hundreds of barge loads of goods were shipped each year along the Rideau, allowing Montreal to compete commercially in the 1830s and 40s with New York (which had the Erie Canal) as a major North American port.

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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