State Route 99 over Poso Creek Overflow
FairKern County, California · 06-KER-099-41.85 · Structure no. 50 0180
- Built
- 1947
- 78 years old, rebuilt 1968
- Condition
- Fair
- inspected October 2023
- Type
- Slab
- Concrete Continuous
- Length
- 48 ft
- 2 main spans
- Daily traffic
- 90,000
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 over Poso Creek Overflow is a concrete continuous slab carrying State Route 99 over Poso Creek Overflow in Kern County, California. It was built in 1947 and reconstructed in 1968, so it is 78 years old, older 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 90,000 vehicles a day, roughly 28% of them trucks, projected to reach 119,854 by 2045. The structure is 48 ft (14.6 m) long and 129 ft wide. If it were closed, the detour would be 11.2 mi (18 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 over Poso Creek Overflow built?
It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1968.
What condition is State Route 99 over Poso Creek Overflow 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 October 2023.
How much traffic does State Route 99 over Poso Creek Overflow carry?
About 90,000 vehicles per day (2018 count), of which roughly 28% are trucks.
How long is State Route 99 over Poso Creek Overflow?
The structure is 48 ft (14.6 m) long with a longest span of 24 ft (7.3 m) and a deck 129 ft wide.
Who owns State Route 99 over Poso Creek Overflow?
It is owned by the State Highway Agency.