(Headquarters Road, 32', 1997, 38-09-e) across a brook SW of Erwinna, Tinicum Township, Bucks County, PA. Headquarters Rd. SW 0.9 miles from jct with PA32 (River Rd.) on the E. side of Erwinna to the bridge at 275. (4-12-06, N40° 29.63', W75° 04.74') Photo by Dan McWilliams.