(Headquarters Road, 32', 1997, 38-09-e) across a brook SW of Erwinna, Tinicum Township, Bucks County, PA. Headquarters Rd. S. (turns W.) 1.25 miles from jct with Geigel Hill Rd. in Erwinna to the bridge on the S. side of the road at 275 up a driveway 250’. (N40 29.560 W75 05.274) Photo by Dan McWilliams 4-12-06.