SH 78 over Castle Creek
FairOwyhee County, Idaho · 18.8 E. Murphy · Structure no. 000000000015280
- Built
- 1955
- 70 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Concrete
- Length
- 62 ft
- 2 main spans
- Daily traffic
- 580
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 78 over Castle Creek is a concrete stringer/multi-beam or girder carrying SH 78 over Castle Creek in Owyhee County, Idaho. It was built in 1955, so it is 70 years old, older than the Idaho average of 45.3 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 580 vehicles a day, roughly 57% of them trucks, projected to reach 870 by 2042. The structure is 62 ft (18.9 m) long and 27 ft wide. If it were closed, the detour would be 14.3 mi (23 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 78 over Castle Creek built?
It was built in 1955, making it 70 years old in 2025.
What condition is SH 78 over Castle Creek 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 August 2024.
How much traffic does SH 78 over Castle Creek carry?
About 580 vehicles per day (2023 count), of which roughly 57% are trucks.
How long is SH 78 over Castle Creek?
The structure is 62 ft (18.9 m) long with a longest span of 30 ft (9.1 m) and a deck 27 ft wide.
Who owns SH 78 over Castle Creek?
It is owned by the State Highway Agency.