+47.64275, -122.31767
47°38'34" N, 122°19'04" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:SR 520 over PORTAGE BAY
Structure number:0006819A0000000
Location:0.3 E JCT I-5
Purpose:Carries highway over highway and waterway
Route classification:Principal Arterial - Other Freeways or Expressways (Urban) [12]
Length of largest span:100.1 ft. [30.5 m]
Total length:2840.0 ft. [865.6 m]
Roadway width between curbs:56.1 ft. [17.1 m]
Deck width edge-to-edge:65.3 ft. [19.9 m]
Vertical clearance below bridge:19.7 ft. [6.0 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:Prestressed concrete [5]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: March 2018

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:49,252 [as of 2016]
Truck traffic:4% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Fair [5 out of 9]
Structural appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck geometry appraisal:Meets minimum tolerable limits to be left in place as is [4]
Underclearances appraisal:Meets minimum tolerable limits to be left in place as is [4]
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]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Sufficiency rating:56.8
Recommended work:Bridge rehabilitation because of general structure deterioration or inadequate strength. [35]
Estimated cost of work:$70,432,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
March 2018FairSatisfactoryGoodFair4925256.8
April 2016FairSatisfactoryGoodFair4263656.5
July 2014FairSatisfactoryGoodFair4263656.5
July 2012FairSatisfactoryGoodFair5788656.5
August 2010FairSatisfactoryGoodFair8879954.5
September 2008FairSatisfactoryGoodFair9379454.5
August 2006FairFairGoodFair5845054.5
July 2004PoorPoorGoodFair5845052.5
June 2002PoorPoorGoodSatisfactory5845063.5
December 2000PoorPoorGoodGood5845063.5
September 1998FairSatisfactoryGoodGood5845066.5
May 1996FairSatisfactoryGoodGood5845074.0
December 1994FairSatisfactoryGoodGood5845074.0
March 1992PoorPoorGoodGood8990071.0

Element Data

Source: National Bridge Elements dataset, 2018 edition. This feature is experimental.
Prestressed Concrete Girder/Beamlinear ft.28,80928,805040
Reinforced Concrete Decksq. ft.169,520168,5677500203
Prestressed Concrete Columneach6564010
Reinforced Concrete Abutmentlinear ft.180180000
Reinforced Concrete Pile Cap/Footinglinear ft.11000
Prestressed Concrete Pileeach8476170
Reinforced Concrete Pier Caplinear ft.1,7781,778000
Strip Seal Jointlinear ft.2900580232
Pourable Jointlinear ft.135000135
Compression Jointlinear ft.8110755560
Movable Bearingeach566566000
Bridge Rail
Steel or Aluminum Bridge Raillinear ft.6,5316,5070240
Reinforced Concrete Bridge Raillinear ft.9,4719,465240