US Bridges

I-90 W-S Ramp over I-5

Good

King County, Washington · JCT I-5 · Structure no. 0007565B0000000

Built
1965
60 years old, rebuilt 1988
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
1,245 ft
16 main spans
Daily traffic
19,205
2012 count
Owner
State
State Highway Agency

About this bridge

I-90 W-S Ramp over I-5 is a concrete continuous box beam or girders - multiple carrying I-90 W-S Ramp over I-5 in King County, Washington. It was built in 1965 and reconstructed in 1988, so it is 60 years old, older 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 19,205 vehicles a day, roughly 5% of them trucks, projected to reach 32,111 by 2036. The structure is 1,245 ft (379.5 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-90 W-S Ramp
CrossesI-5
LocationJCT I-5
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.59386, -122.31986
Functional classUrban Principal Arterial - Interstate

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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.8 US tons
Inventory rating21.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20 + Mod
Structure length1,245 ft (379.5 m)
Longest span86 ft (26.2 m)
Deck width26 ft (7.8 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,205 (2012)
Projected traffic32,111 by 2036
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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$16 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 W-S Ramp over I-5 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1988.

What condition is I-90 W-S Ramp over I-5 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 W-S Ramp over I-5 carry?

About 19,205 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is I-90 W-S Ramp over I-5?

The structure is 1,245 ft (379.5 m) long with a longest span of 86 ft (26.2 m) and a deck 26 ft wide.

Who owns I-90 W-S Ramp over I-5?

It is owned by the State Highway Agency.