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The Saginaw River is a 〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed November 7, 2011〕 river in the U.S. state of Michigan. It is formed by the confluence of the Tittabawassee and Shiawassee rivers southwest of Saginaw. It flows northward into the Saginaw Bay of Lake Huron, passing through Bay City, which developed around it in the 19th century. The watershed area is .〔(Saginaw River ) Great Lakes Commission〕 The river is an important shipping route for Mid-Michigan, passing through the cities of Saginaw and Bay City. It is one of Michigan's few inland navigable rivers. The Saginaw River Rear Range Light, one of a pair of lighthouses built in 1876 to improve navigation, was listed on the National Register of Historic Places in 1984. Since the turn of the 21st century, it is being renovated. ==History== The Saginaw River was used for fishing and as a transportation route by canoe by indigenous peoples for thousands of years prior to European colonization. From the 18th century, fur traders and trappers rendezvoused at a post at the mouth or traveled along the river and its tributaries to trade with the Ojibwe tribes of the region for European and American manufactured goods. As towns developed along the river, it supported additional travel inland, as well as powering the operation of sawmills and later factories. The first lighthouse was completed in 1841, and a pair of lighthouses were built in range configuration in 1876. They were converted to electricity in 1915. The Saginaw River Rear Range Light was listed on the National Register of Historic Places in 1984. Since the turn of the 21st century, it is being renovated. In the late 19th century, steamers like the ''Wellington R. Burt'' carried passengers between the major cities of Saginaw and Bay City, as well as to other ports along the Great Lakes. The Saginaw River has continued to be used as a major route for trade, carrying shipping into and out of the region. According to "Saginaw Future," the river carries 4.6 million tons of commerce annually.〔("Saginaw County Industry Concentrations" ), Saginaw Future (Saginaw County economic development), accessed 11 October 2014〕 Other industries developed, with both General Motors and Dow Chemical Company basing major operations from the early 20th century at sites along the river. These generated many industrial jobs for the area economy but both companies have gone through restructuring. New industries in the region have included advanced manufacturing such as Nexteer, medical technology, professional services, renewable energy, and agribusiness.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Saginaw River」の詳細全文を読む スポンサード リンク
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