Oak Knoll Ave over Napa River
GoodPosted for loadNapa County, California · 0.3 MI SW Slvrdo Trail · Structure no. 21C0067
- Built
- 1922
- 103 years old
- Condition
- Good
- inspected May 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 129 ft
- 3 main spans
- Daily traffic
- 2,600
- 2005 count
- Owner
- County
- County Highway Agency
About this bridge
Oak Knoll Ave over Napa River is a concrete continuous tee beam carrying Oak Knoll Ave over Napa River in Napa County, California. It was built in 1922, so it is 103 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. Its operating status is: posted for load restriction.
It carries about 2,600 vehicles a day, roughly 10% of them trucks, projected to reach 3,965 by 2040. The structure is 129 ft (39.3 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Oak Knoll Ave over Napa River built?
It was built in 1922, making it 103 years old in 2025.
What condition is Oak Knoll Ave over Napa River 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 May 2023.
How much traffic does Oak Knoll Ave over Napa River carry?
About 2,600 vehicles per day (2005 count), of which roughly 10% are trucks.
How long is Oak Knoll Ave over Napa River?
The structure is 129 ft (39.3 m) long with a longest span of 61 ft (18.6 m) and a deck 24 ft wide.
Who owns Oak Knoll Ave over Napa River?
It is owned by the County Highway Agency.