SR 20 over Higgins Slough
GoodSkagit County, Washington · 1.2 E JCT SR 536 · Structure no. 0008453A0000000
- Built
- 1968
- 57 years old
- Condition
- Good
- inspected August 2024
- Type
- Slab
- Concrete Continuous
- Length
- 74 ft
- 3 main spans
- Daily traffic
- 14,588
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 20 over Higgins Slough is a concrete continuous slab carrying SR 20 over Higgins Slough in Skagit County, Washington. It was built in 1968, so it is 57 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 14,588 vehicles a day, roughly 8% of them trucks, projected to reach 20,487 by 2039. The structure is 74 ft (22.6 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 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 SR 20 over Higgins Slough built?
It was built in 1968, making it 57 years old in 2025.
What condition is SR 20 over Higgins 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 August 2024.
How much traffic does SR 20 over Higgins Slough carry?
About 14,588 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is SR 20 over Higgins Slough?
The structure is 74 ft (22.6 m) long with a longest span of 26 ft (7.8 m) and a deck 44 ft wide.
Who owns SR 20 over Higgins Slough?
It is owned by the State Highway Agency.