US Bridges

I-90 over City Streets

Good

King County, Washington · 0.2 W JCT I-5 · Structure no. 0013706B0000000

Built
1991
34 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
1,222 ft
6 main spans
Daily traffic
11,916
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over City Streets is a prestressed concrete continuous box beam or girders - single or spread carrying I-90 over City Streets in King County, Washington. It was built in 1991, so it is 34 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,916 vehicles a day, roughly 3% of them trucks, projected to reach 18,031 by 2039. The structure is 1,222 ft (372.5 m) long and 45 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI-90
CrossesCity Streets
Location0.2 W JCT I-5
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.59342, -122.32975
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating84 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length1,222 ft (372.5 m)
Longest span230 ft (70.1 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,916 (2023)
Projected traffic18,031 by 2039
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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$17.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over City Streets built?

It was built in 1991, making it 34 years old in 2025.

What condition is I-90 over City Streets in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does I-90 over City Streets carry?

About 11,916 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is I-90 over City Streets?

The structure is 1,222 ft (372.5 m) long with a longest span of 230 ft (70.1 m) and a deck 45 ft wide.

Who owns I-90 over City Streets?

It is owned by the State Highway Agency.