The Manitowoc River is a river in eastern Wisconsin in the United States. It flows into Lake Michigan at the city of Manitowoc. Course The Manitowoc River is formed in eastern Calumet County by its north and south branches: The South Branch Manitowoc River, the longer of the two at , rises in northeastern Fond du Lac County and flows generally northeastwardly into Calumet County, passing the city of Chilton and collecting the Killsnake River. The North Branch Manitowoc River rises in northern Calumet County and flows generally southeastwardly. From the confluence of its forks, the Manitowoc flows generally eastwardly through central Manitowoc County to its mouth at Lake Michigan in the city of Manitowoc. Its largest tributary is the Branch River. Little Manitowoc River The Little Manitowoc River is a stream that flows into Lake Michigan about 1 mi (2 km) north of the mouth of the Manitowoc River. See also List of rivers of Wisconsin References Sources Columbia Gazetteer of North America entry DeLorme (1992). Wisconsin Atlas & Gazetteer. Freeport, Maine: DeLorme. . Rivers of Wisconsin Rivers of Calumet County, Wisconsin Rivers of Fond du Lac County, Wisconsin Rivers of Manitowoc County, Wisconsin Tributaries of Lake Michigan