Trower Ave over Napa Drain
FairNapa County, California · Just E Jefferson ST · Structure no. 21C0129
- Built
- 1970
- 55 years old, rebuilt 1991
- Condition
- Fair
- inspected August 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 33 ft
- 3 main spans
- Daily traffic
- 1,673
- 2017 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Trower Ave over Napa Drain is a concrete continuous culvert carrying Trower Ave over Napa Drain in Napa County, California. It was built in 1970 and reconstructed in 1991, so it is 55 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 1,673 vehicles a day, roughly 10% of them trucks, projected to reach 11,866 by 2043. The structure is 33 ft (10.1 m) long and 128 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Trower Ave over Napa Drain built?
It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1991.
What condition is Trower Ave over Napa Drain 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 August 2023.
How much traffic does Trower Ave over Napa Drain carry?
About 1,673 vehicles per day (2017 count), of which roughly 10% are trucks.
How long is Trower Ave over Napa Drain?
The structure is 33 ft (10.1 m) long with a longest span of 11 ft (3.3 m) and a deck 128 ft wide.
Who owns Trower Ave over Napa Drain?
It is owned by the City or Municipal Highway Agency.