Structure 7990A0000000 · King County, WA

I-5 Southbound over Terrain

Carries I-5 Southbound over Terrain, 2.6 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 FT529 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

529 ft end to end, longest span 150 ft: about 7 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.

Built1967rebuilt 1995
Length528.9 ft161.2 m
Daily traffic103,312counted 2023
Last inspectedAugust 2024every 24 months

Location

StateWashington
CountyKing
Location2.6 N Jct SR 900
CarriesI-5 Southbound
CrossesTerrain
Coordinates47.53528, -122.29725

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length528.9 ft (161.2 m)
Max Span149.9 ft (45.7 m)
Deck Width78.1 ft (23.8 m)
Deck Area3836.6 sq m
Main Spans4
Year Built1967 (reconstructed 1995)

Traffic

Avg Daily Traffic103,312 (2023)
Truck Traffic7%
Lanes On Bridge5

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number0007990A0000000

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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