Cook Road over Napa River
FairNapa County, California · 1.7 MI N Rt 49 Yntvl C R · Structure no. 21C0004
- Built
- 1959
- 66 years old
- Condition
- Fair
- inspected May 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 100 ft
- 1 main span
- Daily traffic
- 40
- 1979 count
- Owner
- County
- County Highway Agency
About this bridge
Cook Road over Napa River is a prestressed concrete tee beam carrying Cook Road over Napa River 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 64 by 2040. The structure is 100 ft (30.5 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 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 Cook Road over Napa River built?
It was built in 1959, making it 66 years old in 2025.
What condition is Cook Road 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 May 2023.
How much traffic does Cook Road over Napa River carry?
About 40 vehicles per day (1979 count), of which roughly 10% are trucks.
How long is Cook Road over Napa River?
The structure is 100 ft (30.5 m) long with a longest span of 99 ft (30.2 m) and a deck 18 ft wide.
Who owns Cook Road over Napa River?
It is owned by the County Highway Agency.