 A report by the Michigan Department of Health found that the Kalamazoo River is now safe for recreational use despite some PCB contamination.The Kalamazoo River makes up a large portion of the Kalamazoo River Watershed, which spans about 162 miles and feeds into Lake Michigan.The 80 miles of the Kalamazoo River and Portage Creek are officially divided into five sections known as Operable Units (OU)