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TEACH Areas of Concern

4 | Lake Michigan and its tributaries

Lake Michigan AOCs. Manistique River: The AOC encompasses the last 1.7 miles of the river before it connects with Lake Michigan; degradation has occurred from the physical alteration of the river (artificial islands and a dam) as well as discharge from paper mills and a wastewater treatment plant.

Menominee River: Forming the boundary between the northeast corner of Wisconsin and the southern tip of Michigan's Upper Peninsula, the river has been polluted by a chemical company, two paper mills, two municipal wastewater treatment plants, a ship building company, and a foundry.

Fox River-Southern Green Bay: Including the largest inland lake in Wisconsin, this AOC's water resources have been affected by runoff pollution from urban and rural areas, municipal and industrial wastewater discharges, and degraded habitats.

Sheboygan River: Serving as a sink for pollutants from three different watersheds, the river is contaminated with suspended solids, PCBs, and heavy metals.

Milwaukee Estuary: Acting as both a source of Lake Michigan pollution and sink for watershed pollutants, urban runoff is the largest source of pollution for the estuary.

Waukegan Harbor: Located in Lake County, Ill., various industrial sites contributed to the harbor's contaminated sediment problem. The harbor has been dredged, and the AOC is close to delisting.

Click for larger image. Grand Calumet River: Originating in the industrial city of Gary, Ind., 90% of the river's flow contains municipal and industrial discharge and combined sewer overflows.

Kalamazoo River: Historic releases of PCBs from de-inking operations at local papermills have degraded the Kalamazoo River.

Muskegon Lake: This inland lake, located on the east shore of Lake Michigan, has suffered from discharges of wastewater plant pollution, combined sewer overflows, and urban runoff.

White Lake: White Lake was originally listed as an AOC primarily due to contaminated groundwater migrating to the lake from the Occidental Chemical Site (formerly Hooker Chemical Company).

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