Duncan RD over Channel B
GoodSan Joaquin County, California · 0.3 MI N Copperopolis RD · Structure no. 29C0389
- Built
- 1963
- 62 years old
- Condition
- Good
- inspected March 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 26 ft
- 2 main spans
- Daily traffic
- 353
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Duncan RD over Channel B is a concrete continuous culvert carrying Duncan RD over Channel B in San Joaquin County, California. It was built in 1963, so it is 62 years old, older 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 353 vehicles a day, roughly 5% of them trucks, projected to reach 1,004 by 2045. The structure is 26 ft (7.9 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Duncan RD over Channel B built?
It was built in 1963, making it 62 years old in 2025.
What condition is Duncan RD over Channel B 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 March 2023.
How much traffic does Duncan RD over Channel B carry?
About 353 vehicles per day (2015 count), of which roughly 5% are trucks.
How long is Duncan RD over Channel B?
The structure is 26 ft (7.9 m) long with a longest span of 13 ft (3.9 m) and a deck 34 ft wide.
Who owns Duncan RD over Channel B?
It is owned by the County Highway Agency.