Occoquan Truss Bridge (Site)
GPS Coordinates: 38.6864598, -77.2621738
Closest Address: 10060 Ox Road, Lorton, VA 22079

These coordinates mark the exact spot where the bridge used to stand until it was destroyed by Hurricane Agnes in 1972. A new pedestrian bridge has been constructed on the old bridge foundations.
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Here follows an excerpt from the 1970 Fairfax County Master Inventory of Historic Sites which contained entries from the Historic American Buildings Survey Inventory:
The Occoquan truss bridge was manufactured by the King Iron Bridge and Manufacturing Company of Cleveland, Ohio, in 1878. Cast iron plates attesting to this fact are fastened to the bridge's superstructure. The stone abutments were built in the same year by John Plaskett, for $900.00, according to Susan A. Plaskett's, "Memories of a Plain Family."
Iron truss bridges replaced wooden ones because of greater strength, durability and fire resistance. The first iron truss bridge constructed in the United States was built by Earl Trumbell in 1840, in Frankford, New York. Occoquan Bridge has design elements of the Whipple truss, patented in 1847.
According to J. N. Clary, State Bridge Engineer for the Department of Highways, the bridge was repaired in 1939, as detailed in Plan LXXV-21. The department holds a prescriptive title to the land on which the bridge is built. Should the Department abandon the right-of-way, the land would revert to the adjacent property owners.
The one-lane bridge is 16 feet wide, out to out, 210 feet long and 31 feet 6 inches high from the bridge floor to the top of the superstructure. It carries State Route 123 over Occoquan River, the center line of which watercourse divides Fairfax and Prince William Counties. The structure is inspected and maintained by Prince William County's Highway Department.