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refined with https://www.openstreetmap.org/changeset/106688287 - And it looks like the private part doesn't start until the far end of the curve, 60 feet beyond where it becomes narrow.  Road dedicated in Peoria Co. Recorder book 1113 page 38 with plat in plat book X page 25.  Also, that house you mentioned has a strip of Park District property to its north and east, as well as the Park District owning the whole wooded area on the other side of the street, up to the landscaped area on the house on the west side of the street.