Hardman Avenue over Napa River Overflow
FairNapa County, California · Just E of Silverado Trail · Structure no. 21C0022
- Built
- 1959
- 66 years old
- Condition
- Fair
- inspected May 2024
- Type
- Slab
- Concrete Continuous
- Length
- 62 ft
- 2 main spans
- Daily traffic
- 1,050
- 2012 count
- Owner
- County
- County Highway Agency
About this bridge
Hardman Avenue over Napa River Overflow is a concrete continuous slab carrying Hardman Avenue over Napa River Overflow in Napa County, California. It was built in 1959, so it is 66 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 1,050 vehicles a day, roughly 10% of them trucks, projected to reach 1,636 by 2046. The structure is 62 ft (18.9 m) long and 32 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Hardman Avenue over Napa River Overflow built?
It was built in 1959, making it 66 years old in 2025.
What condition is Hardman Avenue over Napa River Overflow 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 May 2024.
How much traffic does Hardman Avenue over Napa River Overflow carry?
About 1,050 vehicles per day (2012 count), of which roughly 10% are trucks.
How long is Hardman Avenue over Napa River Overflow?
The structure is 62 ft (18.9 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.
Who owns Hardman Avenue over Napa River Overflow?
It is owned by the County Highway Agency.