Structure 7401F0000000 · King County, WA

I-5 over I-405 NB / SR 518 EB

Carries I-5 over I-405 NB / SR 518 EB, 5.2 N Jct SR 516.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT146 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

146 ft end to end, longest span 50 ft: about 2 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built196660 years old
Length146.0 ft44.5 m
Daily traffic106,282counted 2023
Last inspectedJuly 2023every 24 months

Location

StateWashington
CountyKing
Location5.2 N Jct SR 516
CarriesI-5
CrossesI-405 NB / SR 518 EB
Coordinates47.46122, -122.26506

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length146.0 ft (44.5 m)
Max Span49.9 ft (15.2 m)
Deck Width81.7 ft (24.9 m)
Deck Area1108.0 sq m
Main Spans3
Year Built1966

Traffic

Avg Daily Traffic106,282 (2023)
Truck Traffic7%
Lanes On Bridge5
Lanes Under Bridge1

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0007401F0000000

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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