US Bridges

I-5 over Lucile ST

Poor

King County, Washington · 3.9 N JCT SR 900 · Structure no. 0007734B0000000

Built
1966
59 years old
Condition
Poor
inspected June 2023
Type
Slab
Concrete Continuous
Length
172 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, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 96,847 vehicles a day, roughly 7% of them trucks, projected to reach 144,629 by 2039. The structure is 172 ft (52.4 m) long and 94 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5
CrossesLucile ST
Location3.9 N JCT SR 900
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.55327, -122.31761
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating68 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length172 ft (52.4 m)
Longest span70 ft (21.3 m)
Deck width94 ft (28.5 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96,847 (2023)
Projected traffic144,629 by 2039
Trucks7%
Lanes on structure6
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.5 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.

What condition is I-5 over Lucile ST in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

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 172 ft (52.4 m) long with a longest span of 70 ft (21.3 m) and a deck 94 ft wide.

Who owns I-5 over Lucile ST?

It is owned by the State Highway Agency.