State Route 99 NB over UP RR
FairKern County, California · 06-KER-099-R43.60R · Structure no. 50 0011R
- Built
- 1958
- 67 years old, rebuilt 1970
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 234 ft
- 3 main spans
- Daily traffic
- 30,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 NB over UP RR is a steel stringer/multi-beam or girder carrying State Route 99 NB over UP RR in Kern County, California. It was built in 1958 and reconstructed in 1970, so it is 67 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 30,500 vehicles a day, roughly 28% of them trucks, projected to reach 58,742 by 2045. The structure is 234 ft (71.3 m) long and 55 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 NB over UP RR built?
It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1970.
What condition is State Route 99 NB over UP RR 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 NB over UP RR carry?
About 30,500 vehicles per day (2009 count), of which roughly 28% are trucks.
How long is State Route 99 NB over UP RR?
The structure is 234 ft (71.3 m) long with a longest span of 76 ft (23.2 m) and a deck 55 ft wide.
Who owns State Route 99 NB over UP RR?
It is owned by the State Highway Agency.