US Bridges

I-90 over County Road(old I-90)

Fair

King County, Washington · 17.3 E JCT SR 202 · Structure no. 0009092D0000000

Built
1971
54 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
244 ft
3 main spans
Daily traffic
18,692
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over County Road(old I-90) is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over County Road(old I-90) in King County, Washington. It was built in 1971, so it is 54 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 18,692 vehicles a day, roughly 18% of them trucks, projected to reach 25,291 by 2039. The structure is 244 ft (74.4 m) long and 63 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesI-90
CrossesCounty Road(old I-90)
Location17.3 E JCT SR 202
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.39547, -121.47564
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 rating58 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length244 ft (74.4 m)
Longest span85 ft (25.9 m)
Deck width63 ft (19.3 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,692 (2023)
Projected traffic25,291 by 2039
Trucks18%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 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$6.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over County Road(old I-90) built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-90 over County Road(old I-90) 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 May 2024.

How much traffic does I-90 over County Road(old I-90) carry?

About 18,692 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is I-90 over County Road(old I-90)?

The structure is 244 ft (74.4 m) long with a longest span of 85 ft (25.9 m) and a deck 63 ft wide.

Who owns I-90 over County Road(old I-90)?

It is owned by the State Highway Agency.