Mattole Road over Bear River
FairHumboldt County, California · South of Prescott Road · Structure no. 04C0077
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected August 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 290 ft
- 3 main spans
- Daily traffic
- 231
- 2014 count
- Owner
- County
- County Highway Agency
About this bridge
Mattole Road over Bear River is a concrete continuous box beam or girders - multiple carrying Mattole Road over Bear River in Humboldt County, California. It was built in 1974, so it is 51 years old, younger 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 231 vehicles a day, roughly 9% of them trucks, projected to reach 637 by 2041. The structure is 290 ft (88.5 m) long and 35 ft wide. If it were closed, the detour would be 7.5 mi (12 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 Bear River built?
It was built in 1974, making it 51 years old in 2025.
What condition is Mattole Road over Bear 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 August 2024.
How much traffic does Mattole Road over Bear River carry?
About 231 vehicles per day (2014 count), of which roughly 9% are trucks.
How long is Mattole Road over Bear River?
The structure is 290 ft (88.5 m) long with a longest span of 114 ft (34.7 m) and a deck 35 ft wide.
Who owns Mattole Road over Bear River?
It is owned by the County Highway Agency.