+47.64297, -122.31521
47°38'35" N, 122°18'55" 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:20.0 ft. [6.1 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: April 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:42,636 [as of 2012]
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]
Operating rating:44.6 tons [40.5 metric tons]
Inventory rating:26.7 tons [24.3 metric tons]
Sufficiency rating:56.5

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
April 201656.5FairSatisfactoryGoodFair-42636
July 201456.5FairSatisfactoryGoodFair-42636
July 201256.5FairSatisfactoryGoodFair-57886
August 201054.5FairSatisfactoryGoodFair-88799
September 200854.5FairSatisfactoryGoodFair-93794
August 200654.5FairFairGoodFair-58450
July 200452.5PoorPoorGoodFairSD58450
June 200263.5PoorPoorGoodSatisfactorySD58450
December 200063.5PoorPoorGoodGoodSD58450
September 199866.5FairSatisfactoryGoodGood-58450
May 199674.0FairSatisfactoryGoodGood-58450
December 199474.0FairSatisfactoryGoodGood-58450
March 199271.0PoorPoorGoodGoodSD89900

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Prestressed Concrete Girder/Beamlinear ft.28,80928,805040
Reinforced Concrete Decksq. ft.169,520168,5697500201
Reinforced Concrete Columneach6564010
Reinforced Concrete Abutmentlinear ft.180180000
Reinforced Concrete Pile Cap/Footinglinear ft.11000
Reinforced 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.9,4719,467040