State Route 221 over Basalt Road
GoodNapa County, California · 04-NAP-221-1.50-NAP · Structure no. 21 0039
- Built
- 1944
- 81 years old
- Condition
- Good
- inspected April 2024
- Type
- Slab
- Concrete
- Length
- 35 ft
- 1 main span
- Daily traffic
- 24,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 221 over Basalt Road is a concrete slab carrying State Route 221 over Basalt Road in Napa County, California. It was built in 1944, so it is 81 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 24,500 vehicles a day, roughly 5% of them trucks, projected to reach 41,725 by 2046. The structure is 35 ft (10.6 m) long and 92 ft wide. If it were closed, the detour would be 26.1 mi (42 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 221 over Basalt Road built?
It was built in 1944, making it 81 years old in 2025.
What condition is State Route 221 over Basalt Road in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.
How much traffic does State Route 221 over Basalt Road carry?
About 24,500 vehicles per day (2009 count), of which roughly 5% are trucks.
How long is State Route 221 over Basalt Road?
The structure is 35 ft (10.6 m) long with a longest span of 31 ft (9.6 m) and a deck 92 ft wide.
Who owns State Route 221 over Basalt Road?
It is owned by the State Highway Agency.