I-405 over Terrain

Good Condition58 years old10,582 vehicles/day

Location

StateWashington
CountyKing
Location8.7 N Jct SR 520
CarriesI-405
CrossesTerrain
Coordinates47.75745, -122.18481

Condition Ratings

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

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length433.1 ft (132 m)
Max Span115.2 ft (35.1 m)
Deck Width28.5 ft (8.7 m)
Deck Area1148.4 sq m
Main Spans3
Year Built1968

Traffic

Avg Daily Traffic10,582 (2023)
Truck Traffic5%
Lanes On Bridge1

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Structure Number0008382E0000000

Nearby Bridges

SR 522 over E-n Ramp Br 0.1 mi Good SR 522 Ramp over Sammamish River 0.1 mi Fair I-405 N-e Ramp over Sammamish River 0.1 mi Fair I-405 N-w Ramp over Sammamish R I-405 SR 5 0.1 mi Fair I-405 over SR 522 Sammamish R 0.1 mi Fair I-405 over SR 522 Sammamish R 0.1 mi Fair SR 522 over North CR & Gillman Trail 0.2 mi Good SR 522 over North CR & Gillman Trail 0.2 mi Good SR 522 over North CR & Gillman Trail 0.2 mi Good SR 522 over Sammamish River 0.2 mi Fair