Structure 7741C0000000 · King County, WA

I-5 over Terrain

Carries I-5 over Terrain, 5.6 N Jct SR 900.

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 FT872 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

872 ft end to end, longest span 45 ft: about 2.4 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 slab bridge.

Built1966rebuilt 1992
Length872.0 ft265.8 m
Daily traffic96,609counted 2023
Last inspectedNovember 2024every 24 months

Location

StateWashington
CountyKing
Location5.6 N Jct SR 900
CarriesI-5
CrossesTerrain
Coordinates47.57418, -122.31979

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length872.0 ft (265.8 m)
Max Span44.9 ft (13.7 m)
Deck Width60.7 ft (18.5 m)
Deck Area4917.3 sq m
Main Spans21
Year Built1966 (reconstructed 1992)

Traffic

Avg Daily Traffic96,609 (2023)
Truck Traffic7%
Lanes On Bridge4

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0007741C0000000

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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