US Bridges

I-5 over Lucile ST

Fair

King County, Washington · 3.9 N JCT SR 900 · Structure no. 0007734C0000000

Built
1966
59 years old, rebuilt 1995
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
190 ft
3 main spans
Daily traffic
96,847
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Lucile ST is a concrete continuous slab carrying I-5 over Lucile ST in King County, Washington. It was built in 1966 and reconstructed in 1995, so it is 59 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 96,847 vehicles a day, roughly 7% of them trucks, projected to reach 144,629 by 2039. The structure is 190 ft (57.9 m) long and 79 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-5
CrossesLucile ST
Location3.9 N JCT SR 900
RouteInterstate 5
Coordinates47.55323, -122.31809
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.9 US tons
Inventory rating55 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length190 ft (57.9 m)
Longest span70 ft (21.3 m)
Deck width79 ft (24.1 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96,847 (2023)
Projected traffic144,629 by 2039
Trucks7%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Lucile ST built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1995.

What condition is I-5 over Lucile ST 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 November 2024.

How much traffic does I-5 over Lucile ST carry?

About 96,847 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-5 over Lucile ST?

The structure is 190 ft (57.9 m) long with a longest span of 70 ft (21.3 m) and a deck 79 ft wide.

Who owns I-5 over Lucile ST?

It is owned by the State Highway Agency.