Seattle, Washington

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12th Avenue South Bridge (King County, Washington)
Built 1911; approaches rebuilt in 1917 and 1924
Steel arch bridge over WA 90 (Dearborn Street) on 12th Avenue S in Seattle
Open to traffic

1st Avenue South Bridge (NB) (King County, Washington)
Built 1956
Bascule bridge over Duwamish River on WA 99 in Seattle
Open to traffic

1st Avenue South Bridge (SB) (King County, Washington)
Built 1996
Bascule bridge over Duwamish River West on Southbound WA 99 in Seattle
Open to traffic

Admiral Way Bridge (King County, Washington)
Built 1927
Concrete encased Warren deck truss bridge over Ravine, Fairmount Avenue on SW Admiral Way
Open to traffic

Airport Way Bridge (King County, Washington)
Built 1928; rehabilitated 1981
Deck plate girder bridge over Argo Railroad Yard on Airport Way S
Open to traffic

Alaskan Way Footbridge (King County, Washington)
Built 1908
Pony/through plate girder bridge over Western Ave on Pedestrian
Open to pedestrians only

Alaskan Way Viaduct (King County, Washington)
Built 1953; rehabilitated 1957; replaced 2010-2018
Double-deck stringer bridge running parallel to Alaskan Way along Seattle waterfront
Open to traffic; to be demolished in 2018 after completion of new tunnel

Amgen Helix Bridge (King County, Washington)
Built 2004
Bridge over BNSF (11 sets of tracks) on Pedestrian, bike
Open to pedestrians and cyclists

Aurora Avenue Bridge (King County, Washington)
Built 1931
Deck truss bridge over Lake Union on Aurora Ave./WA 99 in Seattle
Open to traffic

Aurora Footbridge (King County, Washington)
Built 1935
Girder bridge over Aurora Ave N on Pedestrians
Open to pedestrians

Aurora Overpass (King County, Washington)
Built 1961
Concrete rigid frame bridge over Aurora Avenue on Pedestrian Pathway
Open to pedestrians only

Ballard Bridge (King County, Washington)
Built 1917
Bascule bridge over Lake Washington Ship Canal on 15th Avenue W in Seattle
Open to traffic

BNSF - Duwamish River Bridge (King County, Washington)
Built 1928
Single leaf bascule bridge over Duwamish River on BNSF Railroad (single track)
Open to traffic

BNSF - Salmon Bay Bridge No. 4 (King County, Washington)
Built 1913
Warren through truss bridge over Salmon Bay on BNSF Railroad ( 2 tracks)
Open to RR traffic; carries 30-40 passenger and freight trains per day.

Burke-Gilman Trail - Pay Streak Bridge (King County, Washington)
Concrete rigid frame bridge over Pay Streak (Alaska-Yukon-Pacific Exposition Name) on Burke-Gilman Trail
Open to pedestrians only

Burke-Gilman Trail - Rainier Vista Bridge (King County, Washington)
Concrete arch bridge over Rainier Vista on Burke-Gilman Trail
Open to pedestrians only

Burke-Gilman Trail - Sand Point Way NE Overpass (King County, Washington)
Steel stringer bridge over Sand Point Way NE on Burke-Gilman Trail
Open to pedestrians only

Delridge Overpass (King County, Washington)
Built 1960
Concrete rigid frame bridge over Delridge Way on Pedestrian Pathway
Open to pedestrians only

Dravus Street Bridge (King County, Washington)
Built 1935
Steel stringer bridge with lattice railing over Railroad Yards on W Dravus Street
Open to traffic

Elliot Bay Drawbridge (King County, Washington)
Lost Polygonal Warren pony truss with alternating verticals bridge over Elliot Bay on Railroad
No longer exists

Evergreen Point Floating Bridge (King County, Washington)
Built 1963, replaced by new six-lane floating bridge in 2016
Pontoon bridge over Lake Washington on SR 520
Replaced by a new bridge

Fremont Bridge (King County, Washington)
Built 1917
Bascule bridge over Lake Washington Ship Canal on Fremont Avenue North in Seattle
Open to traffic

Grant Street Streetcar Bridge (King County, Washington)
Lost Howe through truss swing bridge over Duwamish River on 14 Street on Grant Street Electric Railway
Superstructure replaced

Hec-Ed Bridge (King County, Washington)
Built 1938
Concrete rigid frame bridge over Montlake Boulevard on University of Washington Pathway
Open to pedestrians

Homer M. Hadley Memorial Bridge (King County, Washington)
Built 1989
Pontoon bridge over Lake Washington on W.B. & Rev I-90
Open to traffic

I-5 - Lake Washington Ship Canal Bridge (King County, Washington)
Built 1962
Deck truss bridge over Lake Washington Ship Canal on I-5 in Seattle
Open to traffic

I5 Weedin Place Fallout Shelter (King County, Washington)
Built 1963
Concrete culvert bridge on I5
Open to pedestrians only

Interlaken Boulevard Overpass (King County, Washington)
Built 1912
Concrete arch bridge over 26th Avenue on E. Interlaken Blvd. in Seattle
Open to traffic

Lacey V. Murrow Memorial Bridge (King County, Washington)
Built 1940; rehabilitated 1992
Steel through arch Potoon bridge over Lake Washington on EB I-90
Open to traffic

Latona Bridge (King County, Washington)
Built 1890; Rebuilt 1909 to allow pedestrian & vehicular traffic; Replaced 1919
Lost Pennsylvania through truss bridge over Union Lake/Lake Washington Canal on Trolley Cars
No longer exists

Latona Railroad Bridge (Temporary) (King County, Washington)
Built 1902; removed 1932
Lost Pony/through plate girder bridge over Lake Washington Canal on Seattle Electric Railway
No longer exists

Magnolia Bridge (King County, Washington)
Built 1929
Deck truss bridge over Smith's Cove & Railroad on W Garfield Street
Open to traffic

Montlake Bridge (King County, Washington)
Built 1925; rehabilitated 1999
Bascule bridge over Montlake Cut on WA 513 in Seattle
Open to traffic

NE Pacific Street Bridge (King County, Washington)
Closed-spandrel arch bridge over Rainier Vista on NE Pacific Street
Open to traffic

North Bridge (King County, Washington)
Built 1924; Struck June 11, 1978; Replaced 1991
Lost Parker through truss bridge over Duwamish River on Spokane Street West Waterway
Replaced by a new bridge

NP - Duwamish River Bridge (King County, Washington)
Built 1911; Repaired and energy translated from the span to the counterweight in late 1920's
Bridge over Duwamish River on Northern Pacific Railroad
Open to traffic Repaired in the late 1920's by taking the operating struts from the counterweight bridge tower and placed on the bascule truss the operating machinery was removed from the span,and built into the counterweight bridge tower

NP - Lake Washington Canal Bridge (King County, Washington)
Built 1914 ; removed in 1976
Lost Warren through truss bridge over Lake Washington Canal on Northern Pacific Railroad
No longer exists

Oxbow Bridge (King County, Washington)
Built 1911; Draw mechanism replaced 1929; Replaced 1956
Lost Warren through truss bridge over Duwamish Waterway on 1st Avenue South
Replaced by a new bridge

Ravenna Park Ravine Bridge (King County, Washington)
Built 1912
Steel arch bridge over Ravenna Park Ravine on 20th Avenue
Open to pedestrians

Riverton Drawbridge (King County, Washington)
Built 1903 of Douglas Fir & Cedar; Closed 1919; Removed 1927
Lost Double-intersection Warren through truss swing bridge over Duwamish River on Old Military Road
Removed but not replaced

Schmitz Park Bridge (King County, Washington)
Built 1935
Concrete rigid frame bridge over Schmitz Blvd, Ravine on Sw Admiral Way
Open to traffic

SECo - Lesci Park Bridge (King County, Washington)
Abandoned closed-spandrel arch bridge over Lake Washington Boulevard
Abandoned

Second Spokane Street Drawbridge (King County, Washington)
Built 1907; Replaced 1917
Pratt through truss bridge over Duwamish River on Spokane Street & Streetcars
Replaced by a new bridge

South Park Bridge (King County, Washington)
Built 2014
Through truss bridge over Duwamish River on 14 Avenue
Open to traffic

South Park Bridge (Old) (King County, Washington)
Built 1931
Bascule bridge over Duwamish River on 14th Avenue South in Seattle
Demolished. Main span removed September 1, 2010.

Spokane Street Bridge (King County, Washington)
Built 1991
Swing bridge over W. Waterway of Duwamish River on SW Spokane Street in Seattle
Open to traffic

SR 520 Floating Bridge (King County, Washington)
Opened in 2016
Floating bridge over Lake Washington on SR 520
Open to traffic

Third Spokane Street Drawbridge (King County, Washington)
Built 1917; Replaced by a new road bridge 1924, streetcar line closed 1928.
Lost Pratt through truss bridge over Duwamish River on Spokane Street & Streetcars
Replaced by a new bridge

University Bridge (King County, Washington)
Built 1919, approaches and bridge deck rebuilt between 1932 and 1933
Bascule bridge over Portage Bay on Eastlake Avenue NE in Seattle
Open to traffic

W. Lake Union Center Pedestrian Bridge (King County, Washington)
Cable-stayed bridge over Westlake Ave N on pedestrian pathway
Open to pedestrians only

Washington Park Arboretum Footbridge (King County, Washington)
Built 1910
Arch bridge over Lake Washington Blvd. E on pedestrian trail in Seattle
Open to pedestrians

Woodbine Way Bridge (King County, Washington)
Built 1928
Concrete arch bridge over Ravine on Woodbine Way in Seattle
Open to traffic

Yesler Way Bridge (King County, Washington)
Built 1909; rehabilitated 1975
Girder bridge over 4th Ave S on Yesler Way
Open to traffic