State Route 178 over Isabella Drain
GoodKern County, California · 06-KER-178-R44.10 · Structure no. 50 0046
- Built
- 1948
- 77 years old, rebuilt 1974
- Condition
- Good
- inspected December 2022
- Type
- Culvert
- Concrete Continuous
- Length
- 24 ft
- 2 main spans
- Daily traffic
- 4,200
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 178 over Isabella Drain is a concrete continuous culvert carrying State Route 178 over Isabella Drain in Kern County, California. It was built in 1948 and reconstructed in 1974, so it is 77 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 4,200 vehicles a day, roughly 9% of them trucks, projected to reach 8,891 by 2044. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 29.8 mi (48 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 |
|---|---|---|
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 178 over Isabella Drain built?
It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1974.
What condition is State Route 178 over Isabella Drain 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 December 2022.
How much traffic does State Route 178 over Isabella Drain carry?
About 4,200 vehicles per day (2009 count), of which roughly 9% are trucks.
How long is State Route 178 over Isabella Drain?
The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.7 m).
Who owns State Route 178 over Isabella Drain?
It is owned by the State Highway Agency.