US Bridges

W-S Ramp I-90 over I-90

Fair

King County, Washington · 2.2 E JCT SR 900 · Structure no. 0009840F0000000

Built
1976
49 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
419 ft
3 main spans
Daily traffic
3,805
2023 count
Owner
State
State Highway Agency

About this bridge

W-S Ramp I-90 over I-90 is a prestressed concrete continuous box beam or girders - multiple carrying W-S Ramp I-90 over I-90 in King County, Washington. It was built in 1976, so it is 49 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 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 3,805 vehicles a day, roughly 6% of them trucks, projected to reach 6,030 by 2039. The structure is 419 ft (127.7 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesW-S Ramp I-90
CrossesI-90
Location2.2 E JCT SR 900
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.53258, -122.02097
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating47 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length419 ft (127.7 m)
Longest span159 ft (48.5 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,805 (2023)
Projected traffic6,030 by 2039
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1976, making it 49 years old in 2025.

What condition is W-S Ramp I-90 over 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 June 2023.

How much traffic does W-S Ramp I-90 over I-90 carry?

About 3,805 vehicles per day (2023 count), of which roughly 6% are trucks.

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

The structure is 419 ft (127.7 m) long with a longest span of 159 ft (48.5 m) and a deck 30 ft wide.

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

It is owned by the State Highway Agency.