Detail section of "Map showing Marked Through Routes in Illinois," prepared by Illinois State Highway Department, February 1, 1917. The Pontiac Trail is shown entering the Chicago Region in the lower left of this image, on the road from Odell to Dwight. The Pontiac Trail intersected with the Illinois Valley Trail at Morris, where it proceeded east to Joliet (where it crossed the Lincoln Highway), and then northeast to Chicago. The arrow next to the road at Lemont is, according to the map legend, the symbol for the East St. Louis-Springfield-Chicago Trail. The road shown on the map running from Plainfield to LaGrange would become 66 in the later 1930s.

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