US Bridges

I-90 over S Fk Snoqualmie R

Fair

King County, Washington · 17.3 E JCT SR 202 · Structure no. 0009092C0000000

Built
1971
54 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
214 ft
3 main spans
Daily traffic
18,692
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 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 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 18,692 vehicles a day, roughly 18% of them trucks, projected to reach 25,291 by 2039. The structure is 214 ft (65.2 m) long and 83 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesI-90
CrossesS Fk Snoqualmie R
Location17.3 E JCT SR 202
RouteInterstate 90
Coordinates47.39442, -121.47592
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.5 US tons
Inventory rating25 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length214 ft (65.2 m)
Longest span94 ft (28.7 m)
Deck width83 ft (25.2 m)
Roadway width77 ft (23.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,692 (2023)
Projected traffic25,291 by 2039
Trucks18%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$8 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 1971, making it 54 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 October 2024.

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

About 18,692 vehicles per day (2023 count), of which roughly 18% are trucks.

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

The structure is 214 ft (65.2 m) long with a longest span of 94 ft (28.7 m) and a deck 83 ft wide.

Who owns I-90 over S Fk Snoqualmie R?

It is owned by the State Highway Agency.