Plymouth Road over Fourmile Canyon
GoodBenton County, Washington · 1.693 MI N of SR 14 · Structure no. 086729000000000
- Built
- 1993
- 32 years old
- Condition
- Good
- inspected February 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 22 ft
- 1 main span
- Daily traffic
- 560
- 2018 count
- Owner
- County
- County Highway Agency
About this bridge
Plymouth Road over Fourmile Canyon is a concrete continuous culvert carrying Plymouth Road over Fourmile Canyon in Benton County, Washington. It was built in 1993, so it is 32 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 560 vehicles a day, roughly 40% of them trucks, projected to reach 750 by 2038. The structure is 22 ft (6.7 m) long and 29 ft wide. If it were closed, the detour would be 37.3 mi (60 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 Plymouth Road over Fourmile Canyon built?
It was built in 1993, making it 32 years old in 2025.
What condition is Plymouth Road over Fourmile Canyon 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 February 2024.
How much traffic does Plymouth Road over Fourmile Canyon carry?
About 560 vehicles per day (2018 count), of which roughly 40% are trucks.
How long is Plymouth Road over Fourmile Canyon?
The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 29 ft wide.
Who owns Plymouth Road over Fourmile Canyon?
It is owned by the County Highway Agency.