20th Avenue NE Bridge

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20th Avenue NE Bridge
A steel-arched bridge over a wooded ravine
Coordinates 47°40′19″N 122°18′21″W / 47.6719°N 122.3058°W / 47.6719; -122.3058Coordinates: 47°40′19″N 122°18′21″W / 47.6719°N 122.3058°W / 47.6719; -122.3058
Other name(s) Ravenna Park Bridge
Heritage status National Register of Historic Places, Seattle city landmark
Characteristics
Design Deck Arch
Material Steel
Total length 354 feet (108 m)
Width 18-foot (5.5 m)
Clearance below 41 feet (12 m)
History
Designer Frank M. Johnson
Engineering design by Arthur Dimock
Opened 1913
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 ft (108 m) long. It has a 250 ft (76 m) arch that rises 41 ft (12 m) over the ravine. It supports an 18 ft (5.5 m) reinforced concrete roadway. The road has been closed to vehicular traffic since 1975, but it is accessible by pedestrians.[2]

References

  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 24, 2011. 
  3. ^ National Register of Historic Places; Annual Listing of Historic Properties (Part II) (PDF). National Park Service. March 1, 1983. p. 8669. 
  4. ^ "Individual Landmarks". City of Seattle Department of Neighborhoods. Retrieved March 25, 2011. 
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