US Bridges

I-90 over Yakima River

Fair

Kittitas County, Washington · 24.1 E JCT SR 906 · Structure no. 0006868A0000000

Built
1962
63 years old, rebuilt 2000
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
256 ft
4 main spans
Daily traffic
17,681
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Yakima River is a concrete continuous box beam or girders - multiple carrying I-90 over Yakima River in Kittitas County, Washington. It was built in 1962 and reconstructed in 2000, so it is 63 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 17,681 vehicles a day, roughly 23% of them trucks, projected to reach 22,727 by 2039. The structure is 256 ft (78 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-90
CrossesYakima River
Location24.1 E JCT SR 906
RouteInterstate 90
Coordinates47.18628, -121.04347
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating60 US tons
Inventory rating36 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length256 ft (78 m)
Longest span106 ft (32.3 m)
Deck width54 ft (16.4 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,681 (2023)
Projected traffic22,727 by 2039
Trucks23%
Lanes on structure3
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$6.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over Yakima River built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2000.

What condition is I-90 over Yakima River 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 September 2023.

How much traffic does I-90 over Yakima River carry?

About 17,681 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-90 over Yakima River?

The structure is 256 ft (78 m) long with a longest span of 106 ft (32.3 m) and a deck 54 ft wide.

Who owns I-90 over Yakima River?

It is owned by the State Highway Agency.