20th Avenue NE Bridge

20th Avenue NE Bridge

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)

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.^[1] Built in 1913, the structure is both listed in the National Register of Historic Places and is a designated city landmark.^[2]^[3]

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.^[1]

References

^ ^a ^b Long, Priscilla (July 23, 2008). "Seattle's Ravenna Park Bridge is constructed in 1913.". HistoryLink.org Online Encyclopedia of Washington State History. http://www.historyink.org/index.cfm?DisplayPage=output.cfm&file_id=8699. Retrieved March 2011.
^ National Register of Historic Places; Annual Listing of Historic Properties (Part II). National Park Service. March 1, 1983. p. 8669. http://www.cr.nps.gov/nr/listings/Weekly_List_FR-March-1-1983-listingyear1982.pdf.
^ "Individual Landmarks". City of Seattle Department of Neighborhoods. http://www.seattle.gov/neighborhoods/preservation/t.htm. Retrieved March 25, 2011.

Bridges and tunnels in and around Seattle

Road bridges:	Alaskan Way Viaduct Ballard Bridge Cowen Park Bridge East Channel Bridge Evergreen Point Floating Bridge First Avenue South Bridge Fremont Bridge George Washington Memorial Bridge (Aurora Bridge) Homer M. Hadley Memorial Bridge (Third Lake Washington Floating Bridge) Jose Rizal Bridge Lacey V. Murrow Memorial Bridge (I-90 Floating Bridge) Magnolia Bridge Montlake Bridge North Queen Anne Drive Bridge Schmitz Park Bridge Ship Canal Bridge South Park Bridge Spokane Street Bridge 20th Avenue NE Bridge University Bridge West Seattle Bridge

Rail bridges/trestles:	Salmon Bay Bridge Wilburton Trestle

Tunnels:	Battery Street Tunnel Great Northern Tunnel Mercer Island Lid Downtown Seattle Transit Tunnel Mount Baker Tunnel Convention Center-Freeway Park Lid Beacon Hill Tunnel

U.S. National Register of Historic Places

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Category:National Register of Historic Places Portal:National Register of Historic Places