State Route 12 over Brigham Ave
FairSonoma County, California · 04-SON-012-R17.10-SRO · Structure no. 20 0217L
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 116 ft
- 1 main span
- Daily traffic
- 30,000
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 12 over Brigham Ave is a prestressed concrete box beam or girders - multiple carrying State Route 12 over Brigham Ave in Sonoma County, California. It was built in 1969, so it is 56 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 30,000 vehicles a day, roughly 2% of them trucks, projected to reach 44,370 by 2046. The structure is 116 ft (35.4 m) long and 58 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 12 over Brigham Ave built?
It was built in 1969, making it 56 years old in 2025.
What condition is State Route 12 over Brigham 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 Brigham Ave carry?
About 30,000 vehicles per day (2014 count), of which roughly 2% are trucks.
How long is State Route 12 over Brigham Ave?
The structure is 116 ft (35.4 m) long with a longest span of 114 ft (34.7 m) and a deck 58 ft wide.
Who owns State Route 12 over Brigham Ave?
It is owned by the State Highway Agency.