US 12 over Slough
GoodGrays Harbor County, Washington · 17.4 E JCT SR 8 · Structure no. 0012999A0000000
- Built
- 1986
- 39 years old
- Condition
- Good
- inspected October 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 131 ft
- 3 main spans
- Daily traffic
- 7,629
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 over Slough is a prestressed concrete slab carrying US 12 over Slough in Grays Harbor County, Washington. It was built in 1986, so it is 39 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 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 7,629 vehicles a day, roughly 16% of them trucks, projected to reach 8,733 by 2039. The structure is 131 ft (39.9 m) long and 41 ft wide. If it were closed, the detour would be 3.7 mi (6 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 US 12 over Slough built?
It was built in 1986, making it 39 years old in 2025.
What condition is US 12 over 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 October 2024.
How much traffic does US 12 over Slough carry?
About 7,629 vehicles per day (2023 count), of which roughly 16% are trucks.
How long is US 12 over Slough?
The structure is 131 ft (39.9 m) long with a longest span of 43 ft (13.1 m) and a deck 41 ft wide.
Who owns US 12 over Slough?
It is owned by the State Highway Agency.