dannmer
The park map shows this as a path, heat map activity shows people using this path, Esri Wayback shows changes in path alignment as the result of construction activity around 2018 or so. Safe to close the note, if you are concerned about this path being closed, don't wait years for someone to survey the path, just call up the park and ask. The number is 630.668.5161

Link to park map: https://cantigny.org/plan-your-visit/park-map/