US Bridges

I-90 W-N Ramp over 4th Ave and Sound Trans

Good

King County, Washington · 0.4 W JCT I-5 · Structure no. 0017597A0000000

Built
2010
15 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
1,155 ft
5 main spans
Daily traffic
11,000
2009 count
Owner
State
State Highway Agency

About this bridge

I-90 W-N Ramp over 4th Ave and Sound Trans is a prestressed concrete box beam or girders - multiple carrying I-90 W-N Ramp over 4th Ave and Sound Trans in King County, Washington. It was built in 2010, so it is 15 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 11,000 vehicles a day, roughly 9% of them trucks, projected to reach 19,316 by 2036. The structure is 1,155 ft (352 m) long and 41 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesI-90 W-N Ramp
Crosses4th Ave and Sound Trans
Location0.4 W JCT I-5
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.59211, -122.32753
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.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating66 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length1,155 ft (352 m)
Longest span276 ft (84.1 m)
Deck width41 ft (12.5 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2009)
Projected traffic19,316 by 2036
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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$12.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 W-N Ramp over 4th Ave and Sound Trans built?

It was built in 2010, making it 15 years old in 2025.

What condition is I-90 W-N Ramp over 4th Ave and Sound Trans 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-N Ramp over 4th Ave and Sound Trans carry?

About 11,000 vehicles per day (2009 count), of which roughly 9% are trucks.

How long is I-90 W-N Ramp over 4th Ave and Sound Trans?

The structure is 1,155 ft (352 m) long with a longest span of 276 ft (84.1 m) and a deck 41 ft wide.

Who owns I-90 W-N Ramp over 4th Ave and Sound Trans?

It is owned by the State Highway Agency.