Mattole RD over Mattole River
PoorHumboldt County, California · 0.8 MI South of Petrolia · Structure no. 04C0078
- Built
- 1958
- 67 years old, rebuilt 1995
- Condition
- Poor
- inspected March 2024
- Type
- Truss - Deck
- Steel
- Length
- 381 ft
- 3 main spans
- Daily traffic
- 412
- 2008 count
- Owner
- County
- County Highway Agency
About this bridge
Mattole RD over Mattole River is a steel truss - deck carrying Mattole RD over Mattole River in Humboldt County, California. It was built in 1958 and reconstructed in 1995, so it is 67 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 412 vehicles a day, roughly 5% of them trucks, projected to reach 546 by 2042. The structure is 381 ft (116 m) long and 27 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mattole RD over Mattole River built?
It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1995.
What condition is Mattole RD over Mattole River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.
How much traffic does Mattole RD over Mattole River carry?
About 412 vehicles per day (2008 count), of which roughly 5% are trucks.
How long is Mattole RD over Mattole River?
The structure is 381 ft (116 m) long with a longest span of 102 ft (31.1 m) and a deck 27 ft wide.
Who owns Mattole RD over Mattole River?
It is owned by the County Highway Agency.