+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