Silverado Trail over Simmons Canyon Creek
FairNapa County, California · 0.35 MI NW Dunaweal Lane · Structure no. 21C0031
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected May 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 30 ft
- 2 main spans
- Daily traffic
- 1,170
- 2012 count
- Owner
- County
- County Highway Agency
About this bridge
Silverado Trail over Simmons Canyon Creek is a concrete continuous culvert carrying Silverado Trail over Simmons Canyon Creek in Napa County, California. It was built in 1978, so it is 47 years old, younger than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 1,170 vehicles a day, roughly 10% of them trucks, projected to reach 1,969 by 2042. The structure is 30 ft (9.1 m) long and 41 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Silverado Trail over Simmons Canyon Creek built?
It was built in 1978, making it 47 years old in 2025.
What condition is Silverado Trail over Simmons Canyon Creek in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.
How much traffic does Silverado Trail over Simmons Canyon Creek carry?
About 1,170 vehicles per day (2012 count), of which roughly 10% are trucks.
How long is Silverado Trail over Simmons Canyon Creek?
The structure is 30 ft (9.1 m) long with a longest span of 14 ft (4.3 m) and a deck 41 ft wide.
Who owns Silverado Trail over Simmons Canyon Creek?
It is owned by the County Highway Agency.