Conn Valley RD over Conn Creek
FairNapa County, California · 4.1 MI E Silverado Trail · Structure no. 21C0077
- Built
- 1920
- 105 years old, rebuilt 1946
- Condition
- Fair
- inspected May 2023
- Type
- Tee Beam
- Concrete
- Length
- 37 ft
- 1 main span
- Daily traffic
- 740
- 2005 count
- Owner
- County
- County Highway Agency
About this bridge
Conn Valley RD over Conn Creek is a concrete tee beam carrying Conn Valley RD over Conn Creek in Napa County, California. It was built in 1920 and reconstructed in 1946, so it is 105 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 740 vehicles a day, roughly 10% of them trucks, projected to reach 1,220 by 2040. The structure is 37 ft (11.3 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Conn Valley RD over Conn Creek built?
It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1946.
What condition is Conn Valley RD over Conn 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 2023.
How much traffic does Conn Valley RD over Conn Creek carry?
About 740 vehicles per day (2005 count), of which roughly 10% are trucks.
How long is Conn Valley RD over Conn Creek?
The structure is 37 ft (11.3 m) long with a longest span of 36 ft (11 m) and a deck 20 ft wide.
Who owns Conn Valley RD over Conn Creek?
It is owned by the County Highway Agency.