US Bridges

I-90 over E Fk Issaquah CR

Fair

King County, Washington · 5.6 E JCT SR 900 · Structure no. 0004040F0000000

Built
1951
74 years old, rebuilt 1975
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
52 ft
3 main spans
Daily traffic
34,108
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over E Fk Issaquah CR is a concrete continuous slab carrying I-90 over E Fk Issaquah CR in King County, Washington. It was built in 1951 and reconstructed in 1975, so it is 74 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 34,108 vehicles a day, roughly 7% of them trucks, projected to reach 51,830 by 2039. The structure is 52 ft (15.8 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-90
CrossesE Fk Issaquah CR
Location5.6 E JCT SR 900
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.53333, -121.95833
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length52 ft (15.8 m)
Longest span20 ft (6.1 m)
Deck width73 ft (22.3 m)
Roadway width54 ft (16.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,108 (2023)
Projected traffic51,830 by 2039
Trucks7%
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$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-90 over E Fk Issaquah CR built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1975.

What condition is I-90 over E Fk Issaquah CR 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 2023.

How much traffic does I-90 over E Fk Issaquah CR carry?

About 34,108 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-90 over E Fk Issaquah CR?

The structure is 52 ft (15.8 m) long with a longest span of 20 ft (6.1 m) and a deck 73 ft wide.

Who owns I-90 over E Fk Issaquah CR?

It is owned by the State Highway Agency.