State Route 29 over Nvrr Napa River Stanly
PoorNapa County, California · 04-NAP-029-R6.99 · Structure no. 21 0049
- Built
- 1977
- 48 years old
- Condition
- Poor
- inspected April 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 2,230 ft
- 13 main spans
- Daily traffic
- 48,000
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 29 over Nvrr Napa River Stanly is a prestressed concrete continuous box beam or girders - multiple carrying State Route 29 over Nvrr Napa River Stanly in Napa County, California. It was built in 1977, so it is 48 years old, younger 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 48,000 vehicles a day, roughly 9% of them trucks, projected to reach 62,400 by 2040. The structure is 2,230 ft (679.7 m) long and 68 ft wide.
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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 State Route 29 over Nvrr Napa River Stanly built?
It was built in 1977, making it 48 years old in 2025.
What condition is State Route 29 over Nvrr Napa River Stanly 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 April 2023.
How much traffic does State Route 29 over Nvrr Napa River Stanly carry?
About 48,000 vehicles per day (2017 count), of which roughly 9% are trucks.
How long is State Route 29 over Nvrr Napa River Stanly?
The structure is 2,230 ft (679.7 m) long with a longest span of 250 ft (76.2 m) and a deck 68 ft wide.
Who owns State Route 29 over Nvrr Napa River Stanly?
It is owned by the State Highway Agency.