State Route 12 WB over Nwp RR
FairSonoma County, California · 04-SON-012-R15.56-SRO · Structure no. 20 0204L
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 219 ft
- 2 main spans
- Daily traffic
- 36,500
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 12 WB over Nwp RR is a prestressed concrete stringer/multi-beam or girder carrying State Route 12 WB over Nwp RR 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 54,271 by 2046. The structure is 219 ft (66.8 m) long and 46 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 | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 12 WB over Nwp RR built?
It was built in 1964, making it 61 years old in 2025.
What condition is State Route 12 WB over Nwp RR 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 WB over Nwp RR carry?
About 36,500 vehicles per day (2016 count), of which roughly 4% are trucks.
How long is State Route 12 WB over Nwp RR?
The structure is 219 ft (66.8 m) long with a longest span of 90 ft (27.4 m) and a deck 46 ft wide.
Who owns State Route 12 WB over Nwp RR?
It is owned by the State Highway Agency.