- A 21-mile recreation and nature trail in northeastern Illinois click the logo above on any page to get back here Maps | History | Nature | Events | Get Involved | Management | Links HOME A Trail of many uses Everyone sees the Old Plank Road Trail (OPRT) differently. Some see it as a place for exercise, a place to jog or take a walk. Birders see it as a nature refuge with fields where they can ...www.oprt.org