I-5 over Portage Creek
FairSnohomish County, Washington · 1.9 N JCT SR 531 · Structure no. 0005440A0000000
- Built
- 1957
- 68 years old, rebuilt 1969
- Condition
- Fair
- inspected March 2024
- Type
- Slab
- Concrete Continuous
- Length
- 121 ft
- 5 main spans
- Daily traffic
- 47,995
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-5 over Portage Creek is a concrete continuous slab carrying I-5 over Portage Creek in Snohomish County, Washington. It was built in 1957 and reconstructed in 1969, so it is 68 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 47,995 vehicles a day, roughly 8% of them trucks, projected to reach 69,515 by 2039. The structure is 121 ft (36.9 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-5 over Portage Creek built?
It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1969.
What condition is I-5 over Portage Creek 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 March 2024.
How much traffic does I-5 over Portage Creek carry?
About 47,995 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is I-5 over Portage Creek?
The structure is 121 ft (36.9 m) long with a longest span of 30 ft (9.1 m) and a deck 55 ft wide.
Who owns I-5 over Portage Creek?
It is owned by the State Highway Agency.