Boundary Flat RD over State Route 178
GoodKern County, California · 06-KER-178-R39.88 · Structure no. 50 0357
- Built
- 1968
- 57 years old
- Condition
- Good
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 150 ft
- 1 main span
- Daily traffic
- 5
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
Boundary Flat RD over State Route 178 is a steel stringer/multi-beam or girder carrying Boundary Flat RD over State Route 178 in Kern County, California. It was built in 1968, so it is 57 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 5 vehicles a day, roughly 20% of them trucks, projected to reach 10 by 2044. The structure is 150 ft (45.7 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Boundary Flat RD over State Route 178 built?
It was built in 1968, making it 57 years old in 2025.
What condition is Boundary Flat RD over State Route 178 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 2024.
How much traffic does Boundary Flat RD over State Route 178 carry?
About 5 vehicles per day (2012 count), of which roughly 20% are trucks.
How long is Boundary Flat RD over State Route 178?
The structure is 150 ft (45.7 m) long with a longest span of 145 ft (44.2 m) and a deck 26 ft wide.
Who owns Boundary Flat RD over State Route 178?
It is owned by the State Highway Agency.