Black River (Rainy River tributary) River in the United States From Wikipedia, the free encyclopedia The Black River is a river of Minnesota. It is a tributary of the Rainy River. CountryUnited StateslocationMinnesotaQuick facts Location, Country ...Black RiverLocationCountryUnited StatesPhysical characteristicsSource • locationMinnesota Close Black River was so named on account of its water being discolored by peat.[1] See also List of rivers of Minnesota 48.5157852°N 93.7951694°W / 48.5157852; -93.7951694[2] References [1]Warren Upham (1920). Minnesota Geographic Names: Their Origin and Historic Significance. Minnesota Historical Society. p. 282. [2]U.S. Geological Survey Geographic Names Information System: Black River [3]U.S. Geological Survey Geographic Names Information System: Black River Minnesota Watersheds USGS Hydrologic Unit Map - State of Minnesota (1974)This article about a location in Koochiching County, Minnesota is a stub. You can help Wikipedia by adding missing information.vteThis article related to a river or creek in Minnesota is a stub. You can help Wikipedia by adding missing information.vte Related Articles~TimelinesTop QsFact Checks