US Bridges

I-5 over SR 529 - Pacific Ave

Fair

Snohomish County, Washington · 4.3 N JCT SR 527 · Structure no. 0007888D0000000

Built
1966
59 years old, rebuilt 2009
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
96 ft
1 main span
Daily traffic
85,636
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over SR 529 - Pacific Ave is a prestressed concrete stringer/multi-beam or girder carrying I-5 over SR 529 - Pacific Ave in Snohomish County, Washington. It was built in 1966 and reconstructed in 2009, 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 85,636 vehicles a day, roughly 6% of them trucks, projected to reach 123,696 by 2039. The structure is 96 ft (29.3 m) long and 82 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5
CrossesSR 529 - Pacific Ave
Location4.3 N JCT SR 527
RouteInterstate 5
CountySnohomish County
StateWashington
Coordinates47.97661, -122.19069
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
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 rating66 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length96 ft (29.3 m)
Longest span93 ft (28.3 m)
Deck width82 ft (25.1 m)
Roadway width79 ft (24.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85,636 (2023)
Projected traffic123,696 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$3.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over SR 529 - Pacific Ave built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2009.

What condition is I-5 over SR 529 - Pacific Ave 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 2024.

How much traffic does I-5 over SR 529 - Pacific Ave carry?

About 85,636 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-5 over SR 529 - Pacific Ave?

The structure is 96 ft (29.3 m) long with a longest span of 93 ft (28.3 m) and a deck 82 ft wide.

Who owns I-5 over SR 529 - Pacific Ave?

It is owned by the State Highway Agency.