SR 12 WB over US 101 & Connector Ramps
FairSonoma County, California · 04-SON-012-R16.01-SRO · Structure no. 20 0208L
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 311 ft
- 4 main spans
- Daily traffic
- 36,500
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
SR 12 WB over US 101 & Connector Ramps is a prestressed concrete stringer/multi-beam or girder carrying SR 12 WB over US 101 & Connector Ramps 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 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 36,500 vehicles a day, roughly 4% of them trucks, projected to reach 54,090 by 2044. The structure is 311 ft (94.8 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 12 WB over US 101 & Connector Ramps built?
It was built in 1964, making it 61 years old in 2025.
What condition is SR 12 WB over US 101 & Connector Ramps 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 SR 12 WB over US 101 & Connector Ramps carry?
About 36,500 vehicles per day (2016 count), of which roughly 4% are trucks.
How long is SR 12 WB over US 101 & Connector Ramps?
The structure is 311 ft (94.8 m) long with a longest span of 81 ft (24.7 m) and a deck 52 ft wide.
Who owns SR 12 WB over US 101 & Connector Ramps?
It is owned by the State Highway Agency.