SR 121 WB Imola Av over Napa River
FairNapa County, California · 04-NAP-121-R5.30-NAP · Structure no. 21 0108L
- Built
- 2007
- 18 years old
- Condition
- Fair
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 2,142 ft
- 13 main spans
- Daily traffic
- 13,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
SR 121 WB Imola Av over Napa River is a prestressed concrete continuous box beam or girders - multiple carrying SR 121 WB Imola Av over Napa River in Napa County, California. It was built in 2007, so it is 18 years old, younger 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 13,500 vehicles a day, roughly 2% of them trucks, projected to reach 32,344 by 2046. The structure is 2,142 ft (653 m) long and 45 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 121 WB Imola Av over Napa River built?
It was built in 2007, making it 18 years old in 2025.
What condition is SR 121 WB Imola Av over Napa River 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 April 2024.
How much traffic does SR 121 WB Imola Av over Napa River carry?
About 13,500 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is SR 121 WB Imola Av over Napa River?
The structure is 2,142 ft (653 m) long with a longest span of 148 ft (45 m) and a deck 45 ft wide.
Who owns SR 121 WB Imola Av over Napa River?
It is owned by the State Highway Agency.