species. Natural water levels in the lake were restored by clearing channels and creating openings in dikes and causeways. Additional habitat was created by constructing approximately of new aquatic and wetland habitat plantings. Also, approximately of shoreline was restored, deep holes were created to locally diversify the lake bottom, and herbicidal and biological controls were implemented to control aquatic and shoreline exotic and undesirable plant species. While for many years it was commonplace for park visitors to feed the ducks and other birds that lived at the lake, this produced an unnaturally and unsustainably large population, as well as many non-native birds such as domesticated breeds of ducks and geese. It is no longer permitted that visitors feed wildlife and as a result the populations have dropped to a sustainable and natural population. See also William W. Powers State Recreation Area References External links Calumet BioBlitz, from the Field Museum of Chicago. Calumet BioBlitz, from Chicago Wilderness Magazine. Eggers Woods and Marsh, from Indiana Audubon Society's Online Birding Guide. Wetlands of the Calumet Region, from Illinois Chapter of the Sierra Club. Rarities in the Rough, from Chicago Wilderness Magazine. Flickr.com images of the Park Shrunken lakes Chicago metropolitan area Geography of Chicago Hammond, Indiana Lakes of Indiana Lakes of Illinois Bodies of water of Lake County, Indiana