Mattole Road over North Fork Mattole River
FairHumboldt County, California · 1.3 NW of Mattole River · Structure no. 04C0146
- Built
- 1961
- 64 years old
- Condition
- Fair
- inspected March 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 218 ft
- 3 main spans
- Daily traffic
- 219
- 2008 count
- Owner
- County
- County Highway Agency
About this bridge
Mattole Road over North Fork Mattole River is a concrete continuous tee beam carrying Mattole Road over North Fork Mattole River in Humboldt County, California. It was built in 1961, so it is 64 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 219 vehicles a day, roughly 5% of them trucks, projected to reach 438 by 2042. The structure is 218 ft (66.3 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mattole Road over North Fork Mattole River built?
It was built in 1961, making it 64 years old in 2025.
What condition is Mattole Road over North Fork Mattole River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.
How much traffic does Mattole Road over North Fork Mattole River carry?
About 219 vehicles per day (2008 count), of which roughly 5% are trucks.
How long is Mattole Road over North Fork Mattole River?
The structure is 218 ft (66.3 m) long with a longest span of 70 ft (21.3 m) and a deck 28 ft wide.
Who owns Mattole Road over North Fork Mattole River?
It is owned by the County Highway Agency.