State Route 178 over Kern River
FairKern County, California · 06-KER-178-R40.00 · Structure no. 50 0280
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected December 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 503 ft
- 3 main spans
- Daily traffic
- 4,200
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 178 over Kern River is a prestressed concrete continuous box beam or girders - multiple carrying State Route 178 over Kern River in Kern County, California. It was built in 1971, so it is 54 years old, younger than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 4,200 vehicles a day, roughly 8% of them trucks, projected to reach 8,610 by 2044. The structure is 503 ft (153.3 m) long and 63 ft wide. If it were closed, the detour would be 39.8 mi (64 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 178 over Kern River built?
It was built in 1971, making it 54 years old in 2025.
What condition is State Route 178 over Kern River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.
How much traffic does State Route 178 over Kern River carry?
About 4,200 vehicles per day (2009 count), of which roughly 8% are trucks.
How long is State Route 178 over Kern River?
The structure is 503 ft (153.3 m) long with a longest span of 200 ft (61 m) and a deck 63 ft wide.
Who owns State Route 178 over Kern River?
It is owned by the State Highway Agency.