US Bridges

I-5 over Smith Ave

Good

Snohomish County, Washington · 3.7 N JCT SR 527 · Structure no. 0008132H0000000

Built
1967
58 years old, rebuilt 2007
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
90,360
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Smith Ave is a prestressed concrete stringer/multi-beam or girder carrying I-5 over Smith Ave in Snohomish County, Washington. It was built in 1967 and reconstructed in 2007, so it is 58 years old, older 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 90,360 vehicles a day, roughly 6% of them trucks, projected to reach 133,524 by 2039. The structure is 110 ft (33.5 m) long and 82 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-5
CrossesSmith Ave
Location3.7 N JCT SR 527
RouteInterstate 5
Coordinates47.96908, -122.19703
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.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.4 US tons
Inventory rating21.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length110 ft (33.5 m)
Longest span107 ft (32.7 m)
Deck width82 ft (25.1 m)
Roadway width79 ft (24.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90,360 (2023)
Projected traffic133,524 by 2039
Trucks6%
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Smith Ave built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2007.

What condition is I-5 over Smith Ave 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 February 2024.

How much traffic does I-5 over Smith Ave carry?

About 90,360 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-5 over Smith Ave?

The structure is 110 ft (33.5 m) long with a longest span of 107 ft (32.7 m) and a deck 82 ft wide.

Who owns I-5 over Smith Ave?

It is owned by the State Highway Agency.