1816 Long, Maj. Stephen H. - A Map/of the/Illenois River/from the Mouth to Gomo`s Village 200 miles/St. Louis September 20. [National Archives, Washington, D.C.]
This map detail shows the Chicago Portage region. The line N of Mudd Lake is the "portage road" followed by Major Long`s expedition; it crossed the Des Plaines River at what later became known as "Laughton`s Ford."