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The Ontonagon River ( ) is a river flowing to Lake Superior on the western Upper Peninsula of Michigan in the United States. The main stem of the river is long〔''The American Rivers Outstanding Rivers List'', Second Edition, May 1991. Compiled and edited by Matthew H. Huntington and John D. Echeverria. Washington, DC: American Rivers, Inc.〕 and is formed by a confluence of several longer branches, portions of which have been collectively designated as a National Wild and Scenic River.〔(Ontonagon Wild and Scenic River website from the National Park Service )〕 Several waterfalls occur on the river including Agate Falls and Bond Falls. ==Course== The Ontonagon River's principal tributaries are its West, South, Middle and East branches, all of which flow in part through the Ottawa National Forest: *The West Branch Ontonagon River is entirely contained in Ontonagon County. It begins at the outlet of Lake Gogebic near the community of Bergland and flows generally east-northeastwardly for approximately ,〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed February 3, 2012〕 collecting the South Branch and passing through a dam which forms the Victoria Reservoir.〔〔 *The South Branch Ontonagon River is formed in southwestern Ontonagon County by the confluence of the short Tenmile Creek and the Cisco Branch Ontonagon River. The Cisco Branch starts in Cisco Lake in eastern Gogebic County and flows generally north-northeastwardly for 〔 to the South Branch, which then flows northwardly for ,〔 passing the community of Ewen, to join the West Branch.〔 *The Middle Branch Ontonagon River, long,〔 issues from Crooked Lake in eastern Gogebic County and initially flows eastwardly, passing the community of Watersmeet. After collecting the Tamarack River, the Middle Branch turns northwardly into Ontonagon County, where it collects the Baltimore River and joins the East Branch.〔 *The East Branch Ontonagon River, long,〔 issues from Jingle Lake in northern Iron County and flows generally northwestwardly through Houghton County into Ontonagon County, where it joins the Middle Branch.〔 Below the confluence of its various branches, the Ontonagon River flows generally north-northwestwardly for 〔 in Ontonagon County to the village of Ontonagon, where it flows into Lake Superior.〔 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「Ontonagon River」の詳細全文を読む スポンサード リンク
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