The Portage River is a 15.5-mile-long (24.9 km) river in the U.S. state of Michigan, flowing mostly southwesterly through northeast Jackson County.The Portage River rises at approximately 42°22′26″N 84°10′48″W in the Portage Lake Swamp in the Waterloo State Recreation Area. The river flows mostly southwest into the Grand River at 42°18′54″N 84°23′42″W in Blackman Charter Township just north of the city of Jackson. The Portage River forms the boundary between the townships of Henrietta and Leoni.
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