(Cobblestone, 54', 1984, 46-29-a) across Hidden Bridge Dr. NW of Pohick, Mt. Vernon Township, Fairfax County, VA. Pohick Rd. (SR638) N. 1.1 miles from jct with US1 in Pohick, W. (curves N.) on Pohick Rd. (SR641) 1.2 miles, E. on Hidden Bridge Dr. 50’ to the bridge overhead. (N38 43.839 W77 13.238) Photo by Don Burnell 05-2003.