State Route 12 over Dutton Ave
FairSonoma County, California · 04-SON-012-R15.30 · Structure no. 20 0203L
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 148 ft
- 3 main spans
- Daily traffic
- 36,500
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 12 over Dutton Ave is a concrete continuous box beam or girders - multiple carrying State Route 12 over Dutton Ave in Sonoma County, California. It was built in 1964, so it is 61 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 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 36,500 vehicles a day, roughly 4% of them trucks, projected to reach 53,021 by 2046. The structure is 148 ft (45.1 m) long and 40 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 12 over Dutton Ave built?
It was built in 1964, making it 61 years old in 2025.
What condition is State Route 12 over Dutton Ave 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 September 2024.
How much traffic does State Route 12 over Dutton Ave carry?
About 36,500 vehicles per day (2016 count), of which roughly 4% are trucks.
How long is State Route 12 over Dutton Ave?
The structure is 148 ft (45.1 m) long with a longest span of 88 ft (26.8 m) and a deck 40 ft wide.
Who owns State Route 12 over Dutton Ave?
It is owned by the State Highway Agency.