US Bridges

I-5 over SR 528 4th ST

Fair

Snohomish County, Washington · 5.3 N JCT US 2 · Structure no. 0004178A0000000

Built
1952
73 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete Continuous
Length
124 ft
3 main spans
Daily traffic
62,168
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over SR 528 4th ST is a concrete continuous tee beam carrying I-5 over SR 528 4th ST in Snohomish County, Washington. It was built in 1952, so it is 73 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 62,168 vehicles a day, roughly 8% of them trucks, projected to reach 94,393 by 2039. The structure is 124 ft (37.8 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5
CrossesSR 528 4th ST
Location5.3 N JCT US 2
RouteInterstate 5
CountySnohomish County
StateWashington
Coordinates48.05171, -122.18474
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length124 ft (37.8 m)
Longest span55 ft (16.8 m)
Deck width60 ft (18.4 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62,168 (2023)
Projected traffic94,393 by 2039
Trucks8%
Lanes on structure3
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$3.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over SR 528 4th ST built?

It was built in 1952, making it 73 years old in 2025.

What condition is I-5 over SR 528 4th 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 February 2023.

How much traffic does I-5 over SR 528 4th ST carry?

About 62,168 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is I-5 over SR 528 4th ST?

The structure is 124 ft (37.8 m) long with a longest span of 55 ft (16.8 m) and a deck 60 ft wide.

Who owns I-5 over SR 528 4th ST?

It is owned by the State Highway Agency.