SR 518 over SR 509

Fair Condition55 years old40,718 vehicles/day

Location

StateWashington
CountyKing
LocationJct SR 509
CarriesSR 518
CrossesSR 509
Coordinates47.47033, -122.33214

Condition Ratings

Overall ConditionFair
Deck6 (Satisfactory)
Superstructure7 (Good)
Substructure7 (Good)
Scour CriticalNot applicable

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignStringer/Multi-beam
Total Length241.1 ft (73.5 m)
Max Span77.1 ft (23.5 m)
Deck Width105.0 ft (32 m)
Deck Area2,352 sq m
Main Spans4
Year Built1971

Traffic

Avg Daily Traffic40,718 (2023)
Truck Traffic2%
Lanes On Bridge7
Lanes Under Bridge5

Inspection & Ownership

Last Inspection324
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number0008745E0000000

Nearby Bridges

So 146th ST over SR 509 0.1 mi Good So 152nd ST over SR 509 0.2 mi Good SR 518 over 8th AVE 0.4 mi Fair SR 518 EB Off Ramp over 8th AVE 0.4 mi Good S 156th ST over SR 509 0.5 mi Good SR 518 over Des Moines Way S 0.6 mi Fair S 156th Way over Miller Creek 0.7 mi Good So 160th ST over SR 509 0.7 mi Good S136th ST over SR 509 0.8 mi Good SR 509 over Des Moines Memorial 1.2 mi Good