Structure 7741F0000000 · King County, WA

I-5 Ramp over Terrain

Carries I-5 Ramp over Terrain, 5.4 N Jct SR 900.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT872 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

872 ft end to end, longest span 42 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.

Built196759 years old
Length872.0 ft265.8 m
Daily traffic4,018counted 2012
Last inspectedFebruary 2024every 24 months

Location

StateWashington
CountyKing
Location5.4 N Jct SR 900
CarriesI-5 Ramp
CrossesTerrain
Coordinates47.57070, -122.31965

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length872.0 ft (265.8 m)
Max Span42.0 ft (12.8 m)
Deck Width25.6 ft (7.8 m)
Deck Area2073.2 sq m
Main Spans21
Year Built1967

Traffic

Avg Daily Traffic4,018 (2012)
Truck Traffic5%
Lanes On Bridge1

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0007741F0000000

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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