(Gretchen Star, OH-36-21) SW of Greenfield, Madison Township, Highland County, OH. OH138 SW 0.7 miles from jct with OH753 in Greenfield to the quilt on the NW side of the road at 11939. Gretchen Foltz. (N39 20.419 W83 24.102) Photos by Jack & June Schmidt 7-16-15.