Structure 6094B0000000 · King County, WA

I-5 over S 336th ST

Carries I-5 over S 336th ST, 0.8 N Jct SR 18.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT198 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

198 ft end to end, longest span 78 ft: about 3 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 box-beam bridge.

Built1959rebuilt 2006
Length198.2 ft60.4 m
Daily traffic92,438counted 2023
Last inspectedMay 2023every 24 months

Location

StateWashington
CountyKing
Location0.8 N Jct SR 18
CarriesI-5
CrossesS 336th ST
Coordinates47.30034, -122.30279

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length198.2 ft (60.4 m)
Max Span78.1 ft (23.8 m)
Deck Width83.0 ft (25.3 m)
Deck Area1528.1 sq m
Main Spans3
Year Built1959 (reconstructed 2006)

Traffic

Avg Daily Traffic92,438 (2023)
Truck Traffic7%
Lanes On Bridge5
Lanes Under Bridge2

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0006094B0000000

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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