SR 520 over LAKE WASHINGTON

Map 

Facts 

Name:	SR 520 over LAKE WASHINGTON
Structure number:	0006651A0000000
Location:	0.7 E JCT SR 513
Purpose:	Carries highway and pedestrian walkway over waterway
Route classification:	Principal Arterial - Other Freeways or Expressways (Urban) [12]
Length of largest span:	240.2 ft. [73.2 m]
Total length:	4335.2 ft. [1321.3 m]
Roadway width between curbs:	51.8 ft. [15.8 m]
Deck width edge-to-edge:	59.1 ft. [18.0 m]
Vertical clearance above deck:	16.1 ft. [4.9 m]
Vertical clearance below bridge:	44.9 ft. [13.7 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]
Main span material:	Steel [3]
Main span design:	Truss - Thru [10]
Deck type:	Concrete Cast-in-Place [1]
Wearing surface:	Bituminous [6]

2010 Inspection 

Status:	Open, no restriction [A]
Average daily traffic:	99,019 [as of 2007]
Truck traffic:	3% of total traffic
Deck condition:	Good [7 out of 9]
Superstructure condition:	Satisfactory [6 out of 9]
Substructure condition:	Satisfactory [6 out of 9]
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]
Operating rating:	30.7 tons [27.9 metric tons]
Inventory rating:	18.8 tons [17.1 metric tons]
Sufficiency rating:	46.5
Estimated cost of work:	$4,419,000

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