Structure 7606A0000000 · King County, WA

I-405 over Rr & City Streets

Carries I-405 over Rr & City Streets, 0.2 N Jct SR 181.

Overall conditionFair

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

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

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT765 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

765 ft end to end, longest span 110 ft: about 2.1 football fields. 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.

Built1965rebuilt 2009
Length765.1 ft233.2 m
Daily traffic77,251counted 2023
Last inspectedApril 2024every 24 months

Location

StateWashington
CountyKing
Location0.2 N Jct SR 181
CarriesI-405
CrossesRr & City Streets
Coordinates47.46478, -122.24220

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length765.1 ft (233.2 m)
Max Span109.9 ft (33.5 m)
Deck Width118.4 ft (36.1 m)
Deck Area8418.5 sq m
Main Spans8
Year Built1965 (reconstructed 2009)

Traffic

Avg Daily Traffic77,251 (2023)
Truck Traffic6%
Lanes On Bridge8
Lanes Under Bridge4

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0007606A0000000

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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