US 12 Moon RD over Slough
GoodThurston County, Washington · 1.0 E Grays Hbr CO · Structure no. 0015666A0000000
- Built
- 1999
- 26 years old
- Condition
- Good
- inspected April 2022
- Type
- Culvert
- Concrete
- Length
- 59 ft
- 4 main spans
- Daily traffic
- 10,063
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 Moon RD over Slough is a concrete culvert carrying US 12 Moon RD over Slough in Thurston County, Washington. It was built in 1999, so it is 26 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 10,063 vehicles a day, roughly 14% of them trucks, projected to reach 14,456 by 2039. The structure is 59 ft (18 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 12 Moon RD over Slough built?
It was built in 1999, making it 26 years old in 2025.
What condition is US 12 Moon RD 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 April 2022.
How much traffic does US 12 Moon RD over Slough carry?
About 10,063 vehicles per day (2023 count), of which roughly 14% are trucks.
How long is US 12 Moon RD over Slough?
The structure is 59 ft (18 m) long with a longest span of 10 ft (3 m) and a deck 36 ft wide.
Who owns US 12 Moon RD over Slough?
It is owned by the State Highway Agency.