Middlefork Savanna Forest Preserve

Once part of a large glacial lake, Middlefork Savanna provides safe harbor for endangered plant and wildlife species, and several environmentally sensitive wetlands that feed into the North Branch of the Chicago River. Chicago Wilderness has identified Middlefork Savanna as one of the most important sites for biodiversity in northeastern Illinois. Because of its size, Middlefork supports an impressive list of uncommon birds, butterflies and other species that require large open areas for survival. Middlefork also serves as a national ecological research site and outdoor classroom for universities, schools, and other organizations.