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SR 520 over LAKE WASHINGTON

Map

Coordinates:
+47.64485, -122.28969
47°38'41" N, 122°17'23" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 520 over LAKE WASHINGTON
Structure number:0006651A0000000
Location:0.7 E JCT SR 513
Purpose:Carries highway over waterway
Route classification:Principal Arterial - Other Freeways or Expressways (Urban) [12]
Length of largest span:100.1 ft. [30.5 m]
Total length:2900.1 ft. [883.9 m]
Roadway width between curbs:51.8 ft. [15.8 m]
Deck width edge-to-edge:59.1 ft. [18.0 m]
Vertical clearance below bridge:42.7 ft. [13.0 m]
Owner:State Highway Agency [01]
Year built:1963
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:29
Main spans material:Concrete continuous [2]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Bituminous [6]

Latest Available Inspection: August 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:70,313 [as of 2016]
Truck traffic:4% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Basically intolerable requiring high priority of corrrective action [3]
Deck geometry appraisal:Superior to present desirable criteria [9]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. [8]
Pier/abutment protection:In place and functioning [2]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Sufficiency rating:53.5
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$62,640,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
August 2017FairGoodSatisfactorySatisfactory7031353.5
August 2015FairGoodSatisfactorySatisfactory6022137.5
July 2013FairGoodSatisfactorySatisfactory6022146.5
July 2011FairGoodSatisfactorySatisfactory9787046.5
June 2009FairGoodSatisfactorySatisfactory9901946.5

Element Data

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.
ElementUnitsQuantity1-Good2-Fair3-Poor4-Serious
Superstructure
Prestressed Concrete Girder/Beamlinear ft.25,91925,789201100
Deck
Reinforced Concrete Decksq. ft.156,600156,600000
Wearing Surfacessq. ft.156,6000156,4901100
Substructure
Reinforced Concrete Abutmentlinear ft.7979000
Prestressed Concrete Pileeach174174000
Reinforced Concrete Pier Caplinear ft.1,7541,71925100
Joints
Assembly without Seal Jointlinear ft.350000350
Bearings
Movable Bearingeach6363000
Fixed Bearingeach5454000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.5,4005,400000
Reinforced Concrete Bridge Raillinear ft.5,4005,3900100