US Bridges

I-5 over S 405 & N 525 Ramps

Fair

Snohomish County, Washington · 1.1 N JCT SR 524 · Structure no. 0011598C0000000

Built
1980
45 years old, rebuilt 1995
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
275 ft
2 main spans
Daily traffic
69,203
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over S 405 & N 525 Ramps is a prestressed concrete continuous stringer/multi-beam or girder carrying I-5 over S 405 & N 525 Ramps in Snohomish County, Washington. It was built in 1980 and reconstructed in 1995, so it is 45 years old, younger 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 69,203 vehicles a day, roughly 6% of them trucks, projected to reach 102,812 by 2039. The structure is 275 ft (83.8 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5
CrossesS 405 & N 525 Ramps
Location1.1 N JCT SR 524
RouteInterstate 5
CountySnohomish County
StateWashington
Coordinates47.83203, -122.26278
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 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 rating15 US tons
Inventory rating11.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length275 ft (83.8 m)
Longest span138 ft (42.1 m)
Deck width71 ft (21.6 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69,203 (2023)
Projected traffic102,812 by 2039
Trucks6%
Lanes on structure4
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$10.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over S 405 & N 525 Ramps built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 1995.

What condition is I-5 over S 405 & N 525 Ramps 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 S 405 & N 525 Ramps carry?

About 69,203 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-5 over S 405 & N 525 Ramps?

The structure is 275 ft (83.8 m) long with a longest span of 138 ft (42.1 m) and a deck 71 ft wide.

Who owns I-5 over S 405 & N 525 Ramps?

It is owned by the State Highway Agency.