20th Avenue NE Bridge explained

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coordinates

Bridge Name:

20th Avenue NE Bridge

Other Name:

Ravenna Park Bridge

Designer:

Frank M. Johnson

Engineering:

Arthur Dimock

Design:

Deck Arch

Material:

Steel

Length:

354feet

Width:

18feet

Below:

41feet

Open:

1913

Closed:

1975 (to vehicles only)

Extra:

Embed:	yes
Ravenna Park Bridge
Designated Other1:	Seattle Landmark
Designated Other1 Date:	January 17, 1977^[1]
Location:	Seattle, Washington
Built:	1913
Architect:	Frank M. Johnson and J.R. Wood & Co
Added:	July 16, 1982
Refnum:	82004246
Mpsub:	Historic Bridges/Tunnels in Washington State TR

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, Washington, United States' Ravenna Park. It was designed by Frank M. Johnson under the direction of city engineer Arthur Dimock. 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 354feet long. It has a 250feet arch that rises 41feet over the ravine. It supports an 18feet reinforced concrete roadway. Beginning on March 11, 1975, a four-month trial began wherein the bridge was closed to vehicular traffic. The bridge did not meet the standards for arterial roads at the time, and upgrading the bridge would have been cost prohibitive.^[4] The trial period was successful and the bridge has been closed to vehicle travel ever since,^[5] but it is accessible by pedestrians and cyclists.^[6]

Notes and References

Web site: Landmarks and Designation. City of Seattle. 2013-03-05. 2013-03-06. https://web.archive.org/web/20130306003250/https://www.seattle.gov/neighborhoods/preservation/landmarks_listing.htm. dead.
Book: National Register of Historic Places; Annual Listing of Historic Properties (Part II). March 1, 1983. National Park Service. 8669. March 25, 2011. November 3, 2011. https://web.archive.org/web/20111103001017/https://www.cr.nps.gov/nr/listings/Weekly_List_FR-March-1-1983-listingyear1982.pdf. dead.
Web site: Individual Landmarks. City of Seattle Department of Neighborhoods. March 25, 2011. https://web.archive.org/web/20100604232253/https://www.seattle.gov/neighborhoods/preservation/t.htm. 2010-06-04. dead.
News: . Ravenna Span Closing to Cars . . 1975-03-10 .
News: . Old bridge being fixed . . 1977-01-12 .
Encyclopedia: Long. Priscilla. Seattle's Ravenna Park Bridge is constructed in 1913.. HistoryLink.org Online Encyclopedia of Washington State History. July 23, 2008. March 24, 2011. https://web.archive.org/web/20111003055710/https://www.historyink.org/index.cfm?DisplayPage=output.cfm&file_id=8699. 2011-10-03. dead.