US Bridges

I-90 over Weber Coulee

Fair

Grant County, Washington · 10.7 E JCT SR 17 · Structure no. 0008137A0000000

Built
1967
58 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
150 ft
3 main spans
Daily traffic
6,042
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Weber Coulee is a concrete continuous slab carrying I-90 over Weber Coulee in Grant County, Washington. It was built in 1967, so it is 58 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,042 vehicles a day, roughly 23% of them trucks, projected to reach 7,561 by 2039. The structure is 150 ft (45.7 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesWeber Coulee
Location10.7 E JCT SR 17
RouteInterstate 90
CountyGrant County
StateWashington
Coordinates47.085, -119.01722
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating47 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length150 ft (45.7 m)
Longest span57 ft (17.4 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,042 (2023)
Projected traffic7,561 by 2039
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over Weber Coulee built?

It was built in 1967, making it 58 years old in 2025.

What condition is I-90 over Weber Coulee in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does I-90 over Weber Coulee carry?

About 6,042 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-90 over Weber Coulee?

The structure is 150 ft (45.7 m) long with a longest span of 57 ft (17.4 m) and a deck 41 ft wide.

Who owns I-90 over Weber Coulee?

It is owned by the State Highway Agency.