State Route 12 over Alonzo Drain
PoorSolano County, California · 04-SOL-012-L2.94-FRFD · Structure no. 23 0228
- Built
- 1980
- 45 years old
- Condition
- Poor
- inspected March 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 66 ft
- 6 main spans
- Daily traffic
- 40,500
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 12 over Alonzo Drain is a concrete continuous culvert carrying State Route 12 over Alonzo Drain in Solano County, California. It was built in 1980, so it is 45 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 40,500 vehicles a day, roughly 5% of them trucks, projected to reach 53,046 by 2044. The structure is 66 ft (20 m) long and 99 ft wide. If it were closed, the detour would be 1.2 mi (2 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 |
|---|---|---|
| Channel and channel protection | 9 Excellent | No problems noted. |
| Culvert | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 12 over Alonzo Drain built?
It was built in 1980, making it 45 years old in 2025.
What condition is State Route 12 over Alonzo Drain 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 March 2024.
How much traffic does State Route 12 over Alonzo Drain carry?
About 40,500 vehicles per day (2019 count), of which roughly 5% are trucks.
How long is State Route 12 over Alonzo Drain?
The structure is 66 ft (20 m) long with a longest span of 10 ft (3.1 m) and a deck 99 ft wide.
Who owns State Route 12 over Alonzo Drain?
It is owned by the State Highway Agency.