+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 

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. ratingEvaluationDeckSuper.Sub.ADT
April 201656.5Not deficientSatisfactoryGoodFair42636
July 201456.5Not deficientSatisfactoryGoodFair42636
July 201256.5Not deficientSatisfactoryGoodFair57886
August 201054.5Not deficientSatisfactoryGoodFair88799
September 200854.5Not deficientSatisfactoryGoodFair93794
August 200654.5Not deficientFairGoodFair58450
July 200452.5Structurally deficientPoorGoodFair58450
June 200263.5Structurally deficientPoorGoodSatisfactory58450
December 200063.5Structurally deficientPoorGoodGood58450
September 199866.5Not deficientSatisfactoryGoodGood58450
May 199674.0Not deficientSatisfactoryGoodGood58450
December 199474.0Not deficientSatisfactoryGoodGood58450
March 199271.0Structurally deficientPoorGoodGood89900