(Stone) across a ditch N. of Ellisville, Chesterfield Township, St. Louis County, MO. Clarkson Rd. (MO340) N. 1.8 miles from jct with MO100 (Manchester Rd.) in Ellisville, W. on Forrest Club Dr. 300’ to the bridge on the S. side of the road. (N38 37.14 W90 35.09) Photo by Jack Schmidt 4-12-06.