Structure 7110F0000000 · King County, WA

I-5 over Nbcd Viaduct Sta 2195

Carries I-5 over Nbcd Viaduct Sta 2195, 0.8 N Jct I-90.

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 FT702 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

702 ft end to end, longest span 80 ft: about 2.0 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 box-beam bridge.

Built196462 years old
Length702.1 ft214 m
Daily traffic30,675counted 2012
Last inspectedAugust 2023every 24 months

Location

StateWashington
CountyKing
Location0.8 N Jct I-90
CarriesI-5
CrossesNbcd Viaduct Sta 2195
Coordinates47.60426, -122.32708

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length702.1 ft (214 m)
Max Span80.1 ft (24.4 m)
Deck Width36.7 ft (11.2 m)
Deck Area2396.8 sq m
Main Spans10
Year Built1964

Traffic

Avg Daily Traffic30,675 (2012)
Truck Traffic5%
Lanes On Bridge2
Lanes Under Bridge7

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0007110F0000000

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.

Nearby Bridges