US Bridges

I-5 NB over Railroad

Fair

Snohomish County, Washington · 3.8 N JCT SR 527 · Structure no. 0008090A0000000

Built
1967
58 years old, rebuilt 2007
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
968 ft
9 main spans
Daily traffic
90,360
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 NB over Railroad is a prestressed concrete stringer/multi-beam or girder carrying I-5 NB over Railroad 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 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 90,360 vehicles a day, roughly 6% of them trucks, projected to reach 133,524 by 2039. The structure is 968 ft (295 m) long and 81 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 NB
CrossesRailroad
Location3.8 N JCT SR 527
RouteInterstate 5
CountySnohomish County
StateWashington
Coordinates47.96969, -122.19561
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.8 US tons
Inventory rating16.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20 + Mod
Structure length968 ft (295 m)
Longest span115 ft (35.1 m)
Deck width81 ft (24.7 m)
Roadway width78 ft (23.9 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
CrossesRailroad
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$36.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 NB over Railroad built?

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

What condition is I-5 NB over Railroad 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 August 2024.

How much traffic does I-5 NB over Railroad carry?

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

How long is I-5 NB over Railroad?

The structure is 968 ft (295 m) long with a longest span of 115 ft (35.1 m) and a deck 81 ft wide.

Who owns I-5 NB over Railroad?

It is owned by the State Highway Agency.