US Bridges

I-90 over S Fk Snoqualmie R

Fair

King County, Washington · 6.3 E JCT SR 202 · Structure no. 0009498B0000000

Built
1974
51 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
367 ft
3 main spans
Daily traffic
18,876
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over S Fk Snoqualmie R is a prestressed concrete continuous stringer/multi-beam or girder carrying I-90 over S Fk Snoqualmie R in King County, Washington. It was built in 1974, so it is 51 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 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 18,876 vehicles a day, roughly 18% of them trucks, projected to reach 25,733 by 2039. The structure is 367 ft (111.9 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesS Fk Snoqualmie R
Location6.3 E JCT SR 202
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.4323, -121.63827
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating31.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length367 ft (111.9 m)
Longest span130 ft (39.6 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,876 (2023)
Projected traffic25,733 by 2039
Trucks18%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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$9.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over S Fk Snoqualmie R built?

It was built in 1974, making it 51 years old in 2025.

What condition is I-90 over S Fk Snoqualmie R 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 May 2024.

How much traffic does I-90 over S Fk Snoqualmie R carry?

About 18,876 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is I-90 over S Fk Snoqualmie R?

The structure is 367 ft (111.9 m) long with a longest span of 130 ft (39.6 m) and a deck 55 ft wide.

Who owns I-90 over S Fk Snoqualmie R?

It is owned by the State Highway Agency.