Mad River Road over Dunbar Creek
GoodTrinity County, California · 5.9 MI S of SR 36 · Structure no. 05C0232
- Built
- 2004
- 21 years old
- Condition
- Good
- inspected June 2023
- Type
- Slab
- Prestressed Concrete
- Length
- 51 ft
- 1 main span
- Daily traffic
- 50
- 2000 count
- Owner
- County
- County Highway Agency
About this bridge
Mad River Road over Dunbar Creek is a prestressed concrete slab carrying Mad River Road over Dunbar Creek in Trinity County, California. It was built in 2004, so it is 21 years old, younger than the California average of 54.8 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 107 by 2042. The structure is 51 ft (15.5 m) long and 33 ft wide. If it were closed, the detour would be 24.9 mi (40 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mad River Road over Dunbar Creek built?
It was built in 2004, making it 21 years old in 2025.
What condition is Mad River Road over Dunbar Creek 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 June 2023.
How much traffic does Mad River Road over Dunbar Creek carry?
About 50 vehicles per day (2000 count), of which roughly 5% are trucks.
How long is Mad River Road over Dunbar Creek?
The structure is 51 ft (15.5 m) long with a longest span of 47 ft (14.3 m) and a deck 33 ft wide.
Who owns Mad River Road over Dunbar Creek?
It is owned by the County Highway Agency.