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King County
Alaskan Way Viaduct [Map · Street View] Double-deck stringer bridge running parallel to Alaskan Way along Seattle waterfrontDemolished 2019Built 1953; rehabilitated 1957; replaced 2010-2019
Amgen Helix Bridge [Map] Bridge over BNSF (11 sets of tracks) on Pedestrian, bikeOpen to pedestrians and cyclistsBuilt 2004
Ballard Swing Bridge (Old) [Map] Lost Howe through truss bridge over Lake Washington Canal on 14 AvenueReplaced by a new bridgeBuilt in 1910; replaced in 1916
Baring Bridge [Map] Suspension bridge over South Fork Skykomish River on NE Index Creek Road in BaringOpen to trafficBuilt 1953
Berrydale Overpass [Map] Timber stringer bridge over Bnsf Rr on Kent-Blk DiamondOpen to trafficBuilt 1931; rehabilitated 1968
BN - Buckley Viaduct [Map] Lost Baltimore deck truss bridge over White River on Burlington Northern RailroadRemovedBuilt 1908; Abandoned & removed ca. 1982
BN - Snoqualmie Weyerhaeuser Mill Bridge [Map · Street View] Lost Pratt through truss bridge over Snoqualmie River on Burlington Northern Railroad (Nee Northern Pacific Railroad)Removed by USACEBuilt 1896 in Wisconsin; Re-erected here 1916; Howe truss replaced in kind 1925; Howe truss replaced w/ DPGs 1955; Sold to Northwest Railway Museum 1975; DPGs destroyed by flooding 1990; Sold to King County for rail reuse 1994; Scrapped 2005
BNSF - Cascade Tunnel [Map] Tunnel under Cascade Mountains on BNSF Railway (former Great Northern Railway)Open to trafficLongest rail tunnnel in the US, finished in 1929 to bypass old tunnel, switchbacks, and 1.7% grade
BNSF - Cedar River Bridge [Map] Lost Warren Through truss bridge over Cedar River on RailroadReplaced by a new bridgeBuilt 1914; Replaced by a DPG in 2008.
BNSF - Foss River Bridge [Map] Deck plate girder, deck truss bridge over Foss River, USFS Rd 68 (Foss River Rd) on BNSF RailwayOpen to trafficBuilt 1909
BNSF - Green River Bridge #5 [Map] Warren through truss bridge over Green River on BNSF RailwayOpen to trafficBuilt 1958 during construction of Hanson Reservoir
BNSF - Stampede Tunnel [Map] Tunnel under the Cascade Mountains just south of Snoqualmie Pass on BNSF Railway (former Northern Pacific Railway)Open to trafficTunnel opened in May of 1888, forced-air ventilation added later
BNSF - WA 167 Overpass [Map] Lost Steel stringer bridge over WA 167 on BNSF RailwayReplaced by a new bridgeBuilt 1925; Replaced 2007
BNSF - Wilburton Trestle [Map · Street View] Deck plate girder and timber stringer bridge over Richards Creek & 8th/9th Streets on BNSF RailwayInactive since 2008Built 1904; Reconstructed 1935, 1941 and 1944
BNSF -Stampede Pass line [Map] Bridge over H.W.channel on railroadOpen to trafficThis 2 RCT bridge was built in 1912 for the Northern Pacific Railroad
Bridge Camp Bridge [Map] Pratt pony truss bridge over White River on Pedestrian WalkwayOpen to trafficBuilt 1902
Carr Bridge [Map] Lost Through truss bridge over Cedar River on Cedar Grove RoadReplaced by a new bridge
East Channel Bridge [Map] Lost Concrete deck girder bridge over Lake Washington on I-90(formerly US 10/Sunset Highway)Replaced by a new bridgeCompleted in 1940 as part of Lake Washington floating bridge project, replacing a deteriorating timber bridge; demolished and replaced circa 1981 as part of I-90 expansion
Edgewick Bridge 617B [Map] Through truss bridge over South Fork Snoqualmie River on 468th Ave SEOpen to trafficBuilt 2004
Edgewick Road Bridge [Map] Lost truss bridge over South Fork Snoqualmie River on Edgewick RoadLostBuilt 1920, Replaced 2004
Elliot Bay Drawbridge [Map] Lost Polygonal Warren pony truss with alternating verticals bridge over Elliot Bay on RailroadNo longer exists
Fremont Bridge [Map · Street View] Bascule bridge over Lake Washington Ship Canal on Fremont Avenue North in SeattleOpen to trafficBuilt 1917
GN - Horseshoe tunnel trestle [Map] Lost Deck plate girder bridge over Martin Creek on Great Northern RailroadRemoved but not replacedBuilt 1893 removed 1929 when line relocated to the south
GN - Old Cascade Tunnel [Map] Abandoned tunnel under the Cascade Mountains on abandoned Great Northern Railway gradeAbandonedThe Original Cascade Tunnel was finished in 1900 and was built to replace a series of 8 switchbacks used to get over the mountains. Deadliest avalanche in US history occurred March 1, 1910 at Wellington (western portal). 96 people killed.
Grant Street Streetcar Bridge [Map] Lost Howe through truss swing bridge over Duwamish River on 14 Street on Grant Street Electric RailwaySuperstructure replaced
Green River Bridge [Map · Street View] Lost Pratt through truss bridge over Green River on S. 3rd Avenue in KentLost to historyBuilt 1914; rehabilitated 1970; removed 2013
Green River Gorge Bridge [Map] Baltimore Petit deck truss bridge over Green River on Green River Gorge Bridge RoadOpen to trafficBuilt 1914; Closed & rehabilitated 1988; Rehabilitated again 2001
Hec-Ed Bridge [Map · Street View] Concrete rigid frame bridge over Montlake Boulevard on University of Washington PathwayOpen to pedestriansBuilt 1938
Jones Road Bridge [Map] Truss bridge over Cedar River on Jones RoadReplaced by a pre-cast concrete girder bridge in 2003Built 1912, Replaced 2003
Juneau Street Footbridge [Map] Lost Deck truss bridge over Great Northern RR on Path at Juneau StreetRemoved but not replacedBuilt 1915
Landsburg Bridge [Map] Lost Pony truss bridge over Cedar River on Landsburg RoadReplaced by a new bridge
Latona Bridge [Map] Lost Pennsylvania through truss bridge over Union Lake/Lake Washington Canal on Trolley CarsNo longer existsBuilt 1890; Rebuilt 1909 to allow pedestrian & vehicular traffic; Replaced 1919
Meadowbrook Bridge [Map · Street View] Parker through truss bridge over Snoqualmie River on 394 Place SE/Meadowbrook Way SEOpen to trafficBuilt 1921, rehabilitated 2005
Mount Si Road Bridge [Map] Through truss bridge over Middle Fork Snoqualmie River on Mount Si Road in TannerReplaced by a NEW THROUGH TRUSS bridge in 2008Built 1904; rehabilitated 1955, Replaced 2008-09
North Bridge [Map] Lost Parker through truss bridge over Duwamish River on Spokane Street West WaterwayReplaced by a new bridgeBuilt 1924; Struck June 11, 1978; Replaced 1991
Novelty Bridge [Map · Street View] Steel through arch bridge over Snoqualmie River on NE 124th Street in Union Hill-Novelty HillOpen to trafficBuilt 2000
NP - Duwamish River Bridge [Map · Street View] Bridge over Duwamish River on Northern Pacific RailroadOpen to traffic Reconstructed 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 towerBuilt 1911; Reconstructed and energy translated from the span to the counterweight in late 1920's
NP - Green River Bridge (3rd) [Map] Lost Warren pony truss bridge over Green River on Northern Pacific RailroadReplaced by a new bridgeBuilt 1897, Replaced 1926 and moved to Lebaum
NP - Sammamish River Bridge (Old) [Map] Lost Double-intersection Warren through truss bridge over Sammamish River on Northern Pacific RailroadReplaced by a new bridgeBuilt 1888; Replaced 1921
Oxbow Bridge [Map] Lost Warren through truss bridge over Duwamish Waterway on 1st Avenue SouthReplaced by a new bridgeBuilt 1911; Draw mechanism replaced 1929; Replaced 1956
Renton Covered Bridge [Map] Lost Through truss bridge over Northern Pacific, Union Pacific, and Great Northern Railroads on 129th StreetDestroyed by fireBuilt 1911
Riverton Drawbridge [Map · Street View] Lost Double-intersection Warren through truss swing bridge over Duwamish River on Old Military RoadRemoved but not replacedBuilt 1903 of Douglas Fir & Cedar; Closed 1919; Removed 1927
Sammamish River Bridge [Map] Open spandrel arch bridge over Sammamish River on NE 90th Street in RedmondOpen to trafficBuilt 2001
South Park Bridge (Old) [Map] Bascule bridge over Duwamish River on 14th Avenue South in SeattleDemolished. Main span removed September 1, 2010.Built 1931
Stone Way Bridge [Map] Pratt through truss bridge over Lake Union on Electric RailroadRemovedBuilt 1911; Demolished 1917
Taylor Creek BridgePony truss bridge over Taylor Creek on Watershed Road #9Open to trafficBuilt 1910
Third Spokane Street Drawbridge [Map] Lost Pratt through truss bridge over Duwamish River on Spokane Street & StreetcarsReplaced by a new bridgeBuilt 1917; Replaced by a new road bridge 1924, streetcar line closed 1928.
Tolt Hill Road Bridge [Map] Through truss bridge over Snoqualmie River on NE Tolt Hill RoadReplaced by a NEW THROUGH TRUSS bridge in 2008Built 1922; rehabilitated 1968, Replaced 2008
University Bridge [Map · Street View] Bascule bridge over Portage Bay on Eastlake Avenue NE in SeattleOpen to trafficBuilt 1919, approaches and bridge deck rebuilt between 1932 and 1933
West Cascade Snowshed [Map] Snowshed on former Great Northern RailwayOpen to pedestriansBuilt in 1911 after an avalanche in the same spot killed 90 people just west of the old Cascade Tunnel in 1910. Due to the high cost of building it was the only all concrete snowshed built by the Great Northern
West Seattle Bridge [Map] Concrete deck girder bridge over Duwamish Waterway & Industrial Flats on West Seattle Expressway/Spokane Street BypassClosed due to serious cracking in March 2020. Expected to remain closed until at least 2022.Built 1984; Closed due to cracking 2020; Expected to reopen at some point in 2022
Whitney Bridge [Map] Lost Parker through truss bridge over Green River on Whitney RoadReplaced by a new bridgeBuilt 1925; removed when new bridge built c. 1990 and placed in field, scrapped c. 2008
Woodbine Way Bridge [Map] Concrete arch bridge over Ravine on Woodbine Way in SeattleOpen to trafficBuilt 1928
Yesler Way Bridge [Map] Girder bridge over 4th Ave S on Yesler WayOpen to trafficBuilt 1909; rehabilitated 1975