I-5 over Gages Slough
GoodSkagit County, Washington · 1.7 N JCT SR 538 · Structure no. 0004795C0000000
- Built
- 1954
- 71 years old, rebuilt 1973
- Condition
- Good
- inspected March 2023
- Type
- Slab
- Concrete Continuous
- Length
- 104 ft
- 5 main spans
- Daily traffic
- 32,965
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-5 over Gages Slough is a concrete continuous slab carrying I-5 over Gages Slough in Skagit County, Washington. It was built in 1954 and reconstructed in 1973, so it is 71 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 32,965 vehicles a day, roughly 10% of them trucks, projected to reach 48,817 by 2039. The structure is 104 ft (31.7 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-5 over Gages Slough built?
It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1973.
What condition is I-5 over Gages Slough 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 March 2023.
How much traffic does I-5 over Gages Slough carry?
About 32,965 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is I-5 over Gages Slough?
The structure is 104 ft (31.7 m) long with a longest span of 22 ft (6.7 m) and a deck 41 ft wide.
Who owns I-5 over Gages Slough?
It is owned by the State Highway Agency.