Seminary ST over Napa Creek
GoodNapa County, California · At Arroyo · Structure no. 21C0092
- Built
- 1904
- 121 years old, rebuilt 1933
- Condition
- Good
- inspected August 2023
- Type
- Arch - Deck
- Masonry
- Length
- 55 ft
- 1 main span
- Daily traffic
- 1,446
- 2011 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Seminary ST over Napa Creek is a masonry arch - deck carrying Seminary ST over Napa Creek in Napa County, California. It was built in 1904 and reconstructed in 1933, so it is 121 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 1,446 vehicles a day, roughly 1% of them trucks, projected to reach 5,344 by 2041. The structure is 55 ft (16.8 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 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 |
|---|---|---|
| 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 Seminary ST over Napa Creek built?
It was built in 1904, making it 121 years old in 2025. It was reconstructed in 1933.
What condition is Seminary ST over Napa Creek 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 August 2023.
How much traffic does Seminary ST over Napa Creek carry?
About 1,446 vehicles per day (2011 count), of which roughly 1% are trucks.
How long is Seminary ST over Napa Creek?
The structure is 55 ft (16.8 m) long with a longest span of 47 ft (14.3 m) and a deck 51 ft wide.
Who owns Seminary ST over Napa Creek?
It is owned by the City or Municipal Highway Agency.