US Bridges

I-90 over Front ST N

Fair

King County, Washington · 1.3 E JCT SR 900 · Structure no. 0008573E0000000

Built
1971
54 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
226 ft
3 main spans
Daily traffic
32,550
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over Front ST N is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over Front ST N in King County, Washington. It was built in 1971, so it is 54 years old, older 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 5 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 32,550 vehicles a day, roughly 7% of them trucks, projected to reach 50,154 by 2039. The structure is 226 ft (68.9 m) long and 55 ft wide.

Location

Open in Google Maps
CarriesI-90
CrossesFront ST N
Location1.3 E JCT SR 900
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.54045, -122.0364
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating17.9 US tons
Inventory rating13.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length226 ft (68.9 m)
Longest span114 ft (34.7 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,550 (2023)
Projected traffic50,154 by 2039
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$5.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over Front ST N built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-90 over Front ST N 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 October 2024.

How much traffic does I-90 over Front ST N carry?

About 32,550 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-90 over Front ST N?

The structure is 226 ft (68.9 m) long with a longest span of 114 ft (34.7 m) and a deck 55 ft wide.

Who owns I-90 over Front ST N?

It is owned by the State Highway Agency.