US Bridges

I-90 over W-S Ramp Richard RD

Good

King County, Washington · 0.2 E JCT I-405 · Structure no. 0008190D0000000

Built
1969
56 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
184 ft
3 main spans
Daily traffic
37,886
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over W-S Ramp Richard RD is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over W-S Ramp Richard RD in King County, Washington. It was built in 1969, so it is 56 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 37,886 vehicles a day, roughly 5% of them trucks, projected to reach 57,523 by 2039. The structure is 184 ft (56.1 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesW-S Ramp Richard RD
Location0.2 E JCT I-405
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.58061, -122.16844
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 inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length184 ft (56.1 m)
Longest span70 ft (21.3 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,886 (2023)
Projected traffic57,523 by 2039
Trucks5%
Lanes on structure2
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

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

It was built in 1969, making it 56 years old in 2025.

What condition is I-90 over W-S Ramp Richard RD 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 May 2023.

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

About 37,886 vehicles per day (2023 count), of which roughly 5% are trucks.

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

The structure is 184 ft (56.1 m) long with a longest span of 70 ft (21.3 m) and a deck 36 ft wide.

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

It is owned by the State Highway Agency.