US Bridges

I-90 EB over I-90 WB

Fair

King County, Washington · 0.2 E JCT I-5 · Structure no. 0012659A0000000

Built
1988
37 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
912 ft
11 main spans
Daily traffic
10,900
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 EB over I-90 WB is a concrete continuous box beam or girders - multiple carrying I-90 EB over I-90 WB in King County, Washington. It was built in 1988, so it is 37 years old, younger 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 10,900 vehicles a day, roughly 3% of them trucks, projected to reach 16,492 by 2039. The structure is 912 ft (278 m) long and 82 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90 EB
CrossesI-90 WB
Location0.2 E JCT I-5
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.59389, -122.32003
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19 US tons
Inventory rating14.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20
Structure length912 ft (278 m)
Longest span100 ft (30.5 m)
Deck width82 ft (25 m)
Roadway width79 ft (24.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,900 (2023)
Projected traffic16,492 by 2039
Trucks3%
Lanes on structure4
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$36.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 EB over I-90 WB built?

It was built in 1988, making it 37 years old in 2025.

What condition is I-90 EB over I-90 WB 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 November 2023.

How much traffic does I-90 EB over I-90 WB carry?

About 10,900 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is I-90 EB over I-90 WB?

The structure is 912 ft (278 m) long with a longest span of 100 ft (30.5 m) and a deck 82 ft wide.

Who owns I-90 EB over I-90 WB?

It is owned by the State Highway Agency.