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Humpback Bridge

Photos 

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

Map 

Description 

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

Facts 

Overview
Lost Ribbed closed-spandrel arch bridge over Boundary Channel on George Washington Memorial Parkway
Location
Washington, District of Columbia
Status
Replaced by new bridge
History
Built 1932; rehabilitated 1993
Builders
- Merritt-Chapman & Scott Corporation of New York, New York
- U.S. Bureau of Public Roads of Washington, D.C.
Design
Cantilevered Concrete Ribbed Deck Arch With Stone Facade
Dimensions
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:
Alexandria
Inventory number
BH 48577 (Bridgehunter.com ID)
Inspection (as of 04/2009)
Deck condition rating: Good (7 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Good (7 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 63.1 (out of 100)
Average daily traffic (as of 2007)
25,200

Update Log 

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

Sources