Edward L. Ryerson Conservation Area — Rare species, rare communities and high quality natural areas combine to make this a very special preserve. More than half of the land is so ecologically valuable that it is dedicated as an Illinois Nature Preserve and benefits from special protection rules. Over 6.5 miles of scenic trails wind through woods to the Des Plaines River. Trails here are open to hikers and, when snow is at least four inches deep, cross-country skiers. Please note: due to the nature preserve designation, bicycles, snowmobiles, dogs, horses and other pets are not allowed at this preserve.