Old Sonoma RD over Carneros Creek
FairNapa County, California · 0.2 MI Ne/O SH 121/12 · Structure no. 21C0017
- Built
- 1896
- 129 years old, rebuilt 1914
- Condition
- Fair
- inspected May 2024
- Type
- Arch - Deck
- Masonry
- Length
- 35 ft
- 1 main span
- Daily traffic
- 1,959
- 2012 count
- Owner
- County
- County Highway Agency
About this bridge
Old Sonoma RD over Carneros Creek is a masonry arch - deck carrying Old Sonoma RD over Carneros Creek in Napa County, California. It was built in 1896 and reconstructed in 1914, so it is 129 years old, older 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 5 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 1,959 vehicles a day, roughly 10% of them trucks, projected to reach 3,315 by 2046. The structure is 35 ft (10.7 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 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 |
|---|---|---|
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old Sonoma RD over Carneros Creek built?
It was built in 1896, making it 129 years old in 2025. It was reconstructed in 1914.
What condition is Old Sonoma RD over Carneros 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 Old Sonoma RD over Carneros Creek carry?
About 1,959 vehicles per day (2012 count), of which roughly 10% are trucks.
How long is Old Sonoma RD over Carneros Creek?
The structure is 35 ft (10.7 m) long with a longest span of 31 ft (9.3 m) and a deck 29 ft wide.
Who owns Old Sonoma RD over Carneros Creek?
It is owned by the County Highway Agency.