US Bridges

EB I-90 over Tibbetts Creek

Good

King County, Washington · 5.4 E JCT I-405 · Structure no. 0016658B0000000

Built
2004
21 years old
Condition
Good
inspected October 2024
Type
Slab
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
40,835
2023 count
Owner
State
State Highway Agency

About this bridge

EB I-90 over Tibbetts Creek is a prestressed concrete slab carrying EB I-90 over Tibbetts Creek in King County, Washington. It was built in 2004, so it is 21 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 40,835 vehicles a day, roughly 5% of them trucks, projected to reach 61,900 by 2039. The structure is 47 ft (14.3 m) long and 88 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesEB I-90
CrossesTibbetts Creek
Location5.4 E JCT I-405
RouteInterstate 90
Coordinates47.55104, -122.06807
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96 US tons
Inventory rating53 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length47 ft (14.3 m)
Longest span46 ft (14 m)
Deck width88 ft (26.8 m)
Roadway width85 ft (25.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,835 (2023)
Projected traffic61,900 by 2039
Trucks5%
Lanes on structure5
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was EB I-90 over Tibbetts Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is EB I-90 over Tibbetts Creek 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 October 2024.

How much traffic does EB I-90 over Tibbetts Creek carry?

About 40,835 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is EB I-90 over Tibbetts Creek?

The structure is 47 ft (14.3 m) long with a longest span of 46 ft (14 m) and a deck 88 ft wide.

Who owns EB I-90 over Tibbetts Creek?

It is owned by the State Highway Agency.