I have attached a gpx of a track I did last week Near Charleston, Illinois. It starts from hwy. 16 and ends at the Lincoln Log Cabin State Historic Site. FYI: the state historic site is where Abe Lincoln's Father and Step mother lived and they are buried nearby at Shiloh Cemetary. This route is on single lane roads mostly oil and chip variety and winds down a river valey that is very scenic. The lincoln farm is a must see for you history types.