Silverado Trail over Napa River Overflow
GoodNapa County, California · 0.2 MI North Hardman RD · Structure no. 21C0016
- Built
- 1930
- 95 years old, rebuilt 1958
- Condition
- Good
- inspected May 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 86 ft
- 6 main spans
- Daily traffic
- 5,450
- 2005 count
- Owner
- County
- County Highway Agency
About this bridge
Silverado Trail over Napa River Overflow is a concrete continuous tee beam carrying Silverado Trail over Napa River Overflow in Napa County, California. It was built in 1930 and reconstructed in 1958, so it is 95 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 5,450 vehicles a day, roughly 10% of them trucks, projected to reach 8,365 by 2040. The structure is 86 ft (26.1 m) long and 41 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Silverado Trail over Napa River Overflow built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1958.
What condition is Silverado Trail over Napa River Overflow 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 Silverado Trail over Napa River Overflow carry?
About 5,450 vehicles per day (2005 count), of which roughly 10% are trucks.
How long is Silverado Trail over Napa River Overflow?
The structure is 86 ft (26.1 m) long with a longest span of 14 ft (4.3 m) and a deck 41 ft wide.
Who owns Silverado Trail over Napa River Overflow?
It is owned by the County Highway Agency.