20th Avenue NE Bridge

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20th Avenue NE Bridge
A steel-arched bridge over a wooded ravine
Other name(s) Ravenna Park Bridge
Designer Frank M. Johnson
Engineering design Arthur Dimock
Design Deck Arch
Material Steel
Total length 354 feet (108 m)
Width 18-foot (5.5 m)
Clearance below 41 feet (12 m)
Opened 1913
Heritage status National Register of Historic Places, Seattle city landmark
Closed 1975 (to vehicles only)
Designated January 17, 1977[1]

The 20th Avenue NE Bridge (also known as the Ravenna Park Bridge) is a three-hinged, steel, lattice-arched bridge that spans a ravine in Seattle's Ravenna Park. It was designed by Frank M. Johnson under the direction of city engineer Arthur Dimock.[2] Built in 1913, the structure is both listed in the National Register of Historic Places and is a designated city landmark.[3][4]

The structure is 354 feet (108 m) long. It has a 250-foot (76 m) arch that rises 41 feet (12 m) over the ravine. It supports an 18-foot (5.5 m) reinforced concrete roadway. The road has been closed to vehicular traffic since 1975, but it is accessible by pedestrians.[2]

References[edit]

  1. ^ "Landmarks and Designation". City of Seattle. Retrieved 2013-03-05. 
  2. ^ a b Long, Priscilla (July 23, 2008). "Seattle's Ravenna Park Bridge is constructed in 1913.". HistoryLink.org Online Encyclopedia of Washington State History. Retrieved March 2011. 
  3. ^ National Register of Historic Places; Annual Listing of Historic Properties (Part II). National Park Service. March 1, 1983. p. 8669. 
  4. ^ "Individual Landmarks". City of Seattle Department of Neighborhoods. Retrieved March 25, 2011.