Structure 8137C0000000 · Grant County, WA

I-90 over Weber Coulee

Carries I-90 over Weber Coulee, 12.2 E Jct SR 17.

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
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT142 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

142 ft end to end, longest span 54 ft. 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
Length142.1 ft43.3 m
Daily traffic6,042counted 2023
Last inspectedSeptember 2023every 24 months

Location

StateWashington
CountyGrant
Location12.2 E Jct SR 17
CarriesI-90
CrossesWeber Coulee
Coordinates47.08436, -118.98536

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length142.1 ft (43.3 m)
Max Span54.1 ft (16.5 m)
Deck Width41.3 ft (12.6 m)
Deck Area545.6 sq m
Main Spans3
Year Built1967

Traffic

Avg Daily Traffic6,042 (2023)
Truck Traffic23%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number0008137C0000000

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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