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Humpback Bridge


North (River-Side) Elevation, Looking Southeast

Photo taken by Jet Lowe for the Historic American Engineering Record

View photos at Library of Congress

BH Photo #312609



Boundary Channel Bridge is unique among the other bridges erected along the Mount Vernon Memorial Highway. It consists of seven reinforced concrete cantilever girders and two exterior girders of structural steel cantilever trusses encased in concrete. The cantilevered arms extend forty-two feet with the free ends supporting a sixteen foot suspended span. This bridge, built in a style to blend into the surrounding landscape, takes on the natural shape of the arch and is faced with native stone. The bridge becomes part of the landscape even more, with the careful attention to the landforms and plantings surrounding the bridge.

-- Historic American Engineering Record


Lost Ribbed closed-spandrel arch bridge over Boundary Channel on George Washington Memorial Parkway
Washington, District of Columbia
Replaced by new bridge
Built 1932; rehabilitated 1993
- Merritt-Chapman & Scott Corporation of New York, New York
- U.S. Bureau of Public Roads of Washington, D.C.
Cantilevered Concrete Ribbed Deck Arch With Stone Facade
Length of largest span: 107.9 ft.
Total length: 244.1 ft.
Deck width: 47.9 ft.
Also called
Boundary Channel Bridge
Approximate latitude, longitude
+38.86806, -77.03556   (decimal degrees)
38°52'05" N, 77°02'08" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/323402/4304103 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2013)
Inventory number
BH 48577 (Bridgehunter.com ID)
Inspection report (as of April 2017)
Overall condition: Good
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 78 (out of 100)
View more at BridgeReports.com

Update Log 

  • January 6, 2015: HAER photos posted by Dave King
  • April 7, 2011: Added by Nathan Holth


  • Nathan Holth
  • HAER DC-19 - Boundary Channel Bridge, Spanning Boundary Channel, Washington, District of Columbia, DC