I-405 over SR 520

Good Condition60 years old67,108 vehicles/day

Location

StateWashington
CountyKing
Location3.7 N Jct I-90
CarriesI-405
CrossesSR 520
Coordinates47.63206, -122.18822

Condition Ratings

Overall ConditionGood
Deck7 (Good)
Superstructure7 (Good)
Substructure7 (Good)
Scour CriticalNot applicable

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length241.1 ft (73.5 m)
Max Span73.2 ft (22.3 m)
Deck Width88.9 ft (27.1 m)
Deck Area1991.8 sq m
Main Spans4
Year Built1966 (reconstructed 1993)

Traffic

Avg Daily Traffic67,108 (2023)
Truck Traffic6%
Lanes On Bridge6
Lanes Under Bridge6

Inspection & Ownership

Last Inspection424
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number0007596D0000000

Nearby Bridges

I-405 over SR 520 0.0 mi Good I-405 over Northup Way 0.1 mi Good SR 520 E-n Ramp over Northup Way 0.1 mi Good SR 520 W-n Ramp over Northup Way 0.1 mi Fair N-w Ramp over SR 520 0.1 mi Good E-n Ramp SR 520 over I-405 & SR 520 0.1 mi Good SR 520 over 116th AVE NE 0.1 mi Fair I-405 N-e Ramp over 116th AVE NE 0.1 mi Good SR 520 over 116th AVE NE 0.1 mi Fair I-405 over Northup Way 0.1 mi Good