State Route 99 over Kern River
FairKern County, California · 06-KER-099-25.35-BKD · Structure no. 50 0236
- Built
- 1961
- 64 years old, rebuilt 1996
- Condition
- Fair
- inspected October 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 448 ft
- 8 main spans
- Daily traffic
- 140,000
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 over Kern River is a concrete continuous tee beam carrying State Route 99 over Kern River in Kern County, California. It was built in 1961 and reconstructed in 1996, so it is 64 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 5 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 140,000 vehicles a day, roughly 21% of them trucks, projected to reach 170,762 by 2045. The structure is 448 ft (136.4 m) long and 148 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 99 over Kern River built?
It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1996.
What condition is State Route 99 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 October 2023.
How much traffic does State Route 99 over Kern River carry?
About 140,000 vehicles per day (2018 count), of which roughly 21% are trucks.
How long is State Route 99 over Kern River?
The structure is 448 ft (136.4 m) long with a longest span of 60 ft (18.3 m) and a deck 148 ft wide.
Who owns State Route 99 over Kern River?
It is owned by the State Highway Agency.