Deer Park Road over Napa River
PoorNapa County, California · 0.5 MI NE SR 29 · Structure no. 21C0023
- Built
- 1966
- 59 years old
- Condition
- Poor
- inspected May 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 176 ft
- 3 main spans
- Daily traffic
- 3,115
- 2012 count
- Owner
- County
- County Highway Agency
About this bridge
Deer Park Road over Napa River is a concrete continuous tee beam carrying Deer Park Road over Napa River in Napa County, California. It was built in 1966, so it is 59 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 3,115 vehicles a day, roughly 10% of them trucks, projected to reach 5,193 by 2046. The structure is 176 ft (53.6 m) long and 37 ft wide. If it were closed, the detour would be 4.3 mi (7 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 Deer Park Road over Napa River built?
It was built in 1966, making it 59 years old in 2025.
What condition is Deer Park Road over Napa River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.
How much traffic does Deer Park Road over Napa River carry?
About 3,115 vehicles per day (2012 count), of which roughly 10% are trucks.
How long is Deer Park Road over Napa River?
The structure is 176 ft (53.6 m) long with a longest span of 70 ft (21.3 m) and a deck 37 ft wide.
Who owns Deer Park Road over Napa River?
It is owned by the County Highway Agency.