US Bridges

I-90 over Taneum CR

Fair

Kittitas County, Washington · 11.4 E JCT SR 970 · Structure no. 0007724B0000000

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
108 ft
1 main span
Daily traffic
14,959
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Taneum CR is a prestressed concrete stringer/multi-beam or girder carrying I-90 over Taneum CR in Kittitas County, Washington. It was built in 1965, so it is 60 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 5 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 14,959 vehicles a day, roughly 23% of them trucks, projected to reach 18,102 by 2039. The structure is 108 ft (32.9 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesTaneum CR
Location11.4 E JCT SR 970
RouteInterstate 90
CountyKittitas County
StateWashington
Coordinates47.08206, -120.73475
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
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 within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.3 US tons
Inventory rating18.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length108 ft (32.9 m)
Longest span101 ft (30.8 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,959 (2023)
Projected traffic18,102 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$2.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over Taneum CR built?

It was built in 1965, making it 60 years old in 2025.

What condition is I-90 over Taneum CR 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 Taneum CR carry?

About 14,959 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-90 over Taneum CR?

The structure is 108 ft (32.9 m) long with a longest span of 101 ft (30.8 m) and a deck 40 ft wide.

Who owns I-90 over Taneum CR?

It is owned by the State Highway Agency.