US Bridges

EB I-90 over Lake Washington

Fair

King County, Washington · 2.3 E JCT I-5 · Structure no. 000000KO0000000

Built
1940
85 years old, rebuilt 1992
Condition
Fair
inspected May 2023
Type
Arch - Thru
Steel
Length
1,064 ft
1 main span
Daily traffic
68,544
2023 count
Owner
State
State Highway Agency

About this bridge

EB I-90 over Lake Washington is a steel arch - thru carrying EB I-90 over Lake Washington in King County, Washington. It was built in 1940 and reconstructed in 1992, so it is 85 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 68,544 vehicles a day, roughly 3% of them trucks, projected to reach 104,170 by 2039. The structure is 1,064 ft (324.3 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesEB I-90
CrossesLake Washington
Location2.3 E JCT I-5
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.58997, -122.28731
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+7 approach)
Design loadHS 20 + Mod
Structure length1,064 ft (324.3 m)
Longest span215 ft (65.5 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deck21 ft (6.4 m)

Traffic and service

Average daily traffic68,544 (2023)
Projected traffic104,170 by 2039
Trucks3%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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 statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$34.9 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was EB I-90 over Lake Washington built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1992.

What condition is EB I-90 over Lake Washington 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 2023.

How much traffic does EB I-90 over Lake Washington carry?

About 68,544 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is EB I-90 over Lake Washington?

The structure is 1,064 ft (324.3 m) long with a longest span of 215 ft (65.5 m) and a deck 55 ft wide.

Who owns EB I-90 over Lake Washington?

It is owned by the State Highway Agency.