US Bridges

I-90 over W Sparks RD

Fair

Kittitas County, Washington · 14.3 E JCT SR 906 · Structure no. 0009806B0000000

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete
Length
31 ft
1 main span
Daily traffic
17,108
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over W Sparks RD is a concrete frame carrying I-90 over W Sparks RD in Kittitas County, Washington. It was built in 1975, so it is 50 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 17,108 vehicles a day, roughly 21% of them trucks, projected to reach 21,135 by 2039. The structure is 31 ft (9.4 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesW Sparks RD
Location14.3 E JCT SR 906
RouteInterstate 90
CountyKittitas County
StateWashington
Coordinates47.25964, -121.21015
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.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.9 US tons
Inventory rating46 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width53 ft (16.3 m)
Roadway width51 ft (15.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,108 (2023)
Projected traffic21,135 by 2039
Trucks21%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$766,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over W Sparks RD built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-90 over W Sparks RD 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 July 2023.

How much traffic does I-90 over W Sparks RD carry?

About 17,108 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is I-90 over W Sparks RD?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 53 ft wide.

Who owns I-90 over W Sparks RD?

It is owned by the State Highway Agency.