Calistoga Road over Austin Creek
GoodSonoma County, California · N Intrx With S.R. 12 · Structure no. 20C0176
- Built
- 1960
- 65 years old
- Condition
- Good
- inspected August 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 26 ft
- 2 main spans
- Daily traffic
- 17,770
- 2010 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Calistoga Road over Austin Creek is a concrete continuous culvert carrying Calistoga Road over Austin Creek in Sonoma County, California. It was built in 1960, so it is 65 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 17,770 vehicles a day, roughly 2% of them trucks, projected to reach 21,734 by 2042. The structure is 26 ft (7.9 m) long and 86 ft wide. If it were closed, the detour would be 3.7 mi (6 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Calistoga Road over Austin Creek built?
It was built in 1960, making it 65 years old in 2025.
What condition is Calistoga Road over Austin 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 2024.
How much traffic does Calistoga Road over Austin Creek carry?
About 17,770 vehicles per day (2010 count), of which roughly 2% are trucks.
How long is Calistoga Road over Austin Creek?
The structure is 26 ft (7.9 m) long with a longest span of 13 ft (4 m) and a deck 86 ft wide.
Who owns Calistoga Road over Austin Creek?
It is owned by the City or Municipal Highway Agency.