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Ottawa River (Lake Erie)
The Ottawa River, also known as Ottawa Creek, is a short river, approximately long〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed May 19, 2011〕 (or about 〔 if Tenmile Creek, the longest tributary, is included), in northwest Ohio and southeast Michigan in the United States. It drains an area on the Ohio-Michigan border along the eastern and northern fringes of the city of Toledo, goes through Ottawa Hills, and empties directly into Lake Erie. It is one of two rivers in northwestern Ohio that share the same name, along with the Ottawa River that is a tributary of the Auglaize River. The upper of the river in Michigan north of Sylvania, Ohio is called North Tenmile Creek on federal maps, while another branch rising in Fulton County, Ohio, is called Tenmile Creek.
North Tenmile Creek rises in extreme southeastern Michigan, southwest of Ottawa Lake, approximately north of the Ohio-Michigan state line. The creek flows south across the state line to Sylvania, where it is joined by Tenmile Creek to form the Ottawa River, approximately northwest of Toledo. The river then flows southeast into western Toledo, where it turns northeast. For its lower it flows along the north side of Toledo roughly parallel to the Maumee River, separated from it by approximately . It crosses the Michigan state line for its final , entering Little Maumee Bay on Lake Erie.
==Pollutants==
The Ottawa River Risk Assessment, a report published in 2000, tested the water of the lower section of the Ottawa River, and found many chemicals in the water with an hazard quotient greater than 1 (from highest to lowest concentration): lead, aluminum, PCBs, manganese, iron, DDT, thallium, selenium, chromium, nickel, cadmium, cyanide, and zinc.〔(Parametrix Report )〕
The reasons for the poor water quality are primarily its form and structure, since it has a slow flow, and, secondly, runoff and discharge from landfills and sewers. The City of Toledo has made it a priority to clean up the river, and action has been taken to clear landfills and tributaries.〔http://www.ci.toledo.oh.us/index.cfm?Article=1005〕
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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