US Bridges

I-90 over Farrier Coulee

Good

Adams County, Washington · 4.7 E Grant CO · Structure no. 0009144C0000000

Built
1972
53 years old
Condition
Good
inspected April 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
174 ft
3 main spans
Daily traffic
5,952
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Farrier Coulee is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over Farrier Coulee in Adams County, Washington. It was built in 1972, so it is 53 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,952 vehicles a day, roughly 23% of them trucks, projected to reach 6,892 by 2039. The structure is 174 ft (53 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesFarrier Coulee
Location4.7 E Grant CO
RouteInterstate 90
CountyAdams County
StateWashington
Coordinates47.08693, -118.88151
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating70 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length174 ft (53 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,952 (2023)
Projected traffic6,892 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$3.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over Farrier Coulee built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-90 over Farrier Coulee in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2022.

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

About 5,952 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-90 over Farrier Coulee?

The structure is 174 ft (53 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns I-90 over Farrier Coulee?

It is owned by the State Highway Agency.