311 TH Av SE over Skykomish Slough
GoodSnohomish County, Washington · 0.5 S JCT SR2 · Structure no. 087405000000000
- Built
- 2006
- 19 years old
- Condition
- Good
- inspected November 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 92 ft
- 1 main span
- Daily traffic
- 2,263
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
311 TH Av SE over Skykomish Slough is a prestressed concrete tee beam carrying 311 TH Av SE over Skykomish Slough in Snohomish County, Washington. It was built in 2006, so it is 19 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,263 vehicles a day, roughly 11% of them trucks, projected to reach 3,000 by 2046. The structure is 92 ft (27.9 m) long and 37 ft wide. If it were closed, the detour would be 18 mi (29 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 311 TH Av SE over Skykomish Slough built?
It was built in 2006, making it 19 years old in 2025.
What condition is 311 TH Av SE over Skykomish 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 November 2024.
How much traffic does 311 TH Av SE over Skykomish Slough carry?
About 2,263 vehicles per day (2021 count), of which roughly 11% are trucks.
How long is 311 TH Av SE over Skykomish Slough?
The structure is 92 ft (27.9 m) long with a longest span of 87 ft (26.5 m) and a deck 37 ft wide.
Who owns 311 TH Av SE over Skykomish Slough?
It is owned by the County Highway Agency.