US Bridges

I-90 over Rainier Ave S

Good

King County, Washington · 0.6 E JCT I-5 · Structure no. 0013725F0000000

Built
1992
33 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
296 ft
3 main spans
Daily traffic
56,847
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Rainier Ave S is a prestressed concrete continuous box beam or girders - multiple carrying I-90 over Rainier Ave S in King County, Washington. It was built in 1992, so it is 33 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 56,847 vehicles a day, roughly 3% of them trucks, projected to reach 86,006 by 2039. The structure is 296 ft (90.2 m) long and 109 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-90
CrossesRainier Ave S
Location0.6 E JCT I-5
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.58994, -122.30756
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length296 ft (90.2 m)
Longest span118 ft (36 m)
Deck width109 ft (33.1 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,847 (2023)
Projected traffic86,006 by 2039
Trucks3%
Lanes on structure5
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$13.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over Rainier Ave S built?

It was built in 1992, making it 33 years old in 2025.

What condition is I-90 over Rainier Ave S 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 September 2023.

How much traffic does I-90 over Rainier Ave S carry?

About 56,847 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is I-90 over Rainier Ave S?

The structure is 296 ft (90.2 m) long with a longest span of 118 ft (36 m) and a deck 109 ft wide.

Who owns I-90 over Rainier Ave S?

It is owned by the State Highway Agency.