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.
A 4-mile gravel trail is open for hiking, biking and cross-country skiing. Two boardwalks on the trail help protect sensitive wetland areas. Please keep dogs leashed and on the gravel trails at all times, and pick up after them. A short 0.5-mile mowed grass path is open for hiking only. Dogs are not allowed on the grass trail here.