US Bridges

I-90 over Yakima River

Fair

Kittitas County, Washington · 16.7 E JCT SR 970 · Structure no. 0008010B0000000

Built
1967
58 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
595 ft
6 main spans
Daily traffic
15,974
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 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 15,974 vehicles a day, roughly 23% of them trucks, projected to reach 20,086 by 2039. The structure is 595 ft (181.4 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesYakima River
Location16.7 E JCT SR 970
RouteInterstate 90
CountyKittitas County
StateWashington
Coordinates47.04456, -120.63992
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating30.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length595 ft (181.4 m)
Longest span107 ft (32.6 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,974 (2023)
Projected traffic20,086 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$11.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over Yakima River built?

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

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 October 2024.

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

About 15,974 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-90 over Yakima River?

The structure is 595 ft (181.4 m) long with a longest span of 107 ft (32.6 m) and a deck 35 ft wide.

Who owns I-90 over Yakima River?

It is owned by the State Highway Agency.