Jackknife Road over Jackknife Creek
FairBonneville County, Idaho · 0.9 N. 16.8 E. Grays Lake · Structure no. 000000000031200
- Built
- 1976
- 49 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 24 ft
- 1 main span
- Daily traffic
- 160
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Jackknife Road over Jackknife Creek is a prestressed concrete box beam or girders - multiple carrying Jackknife Road over Jackknife Creek in Bonneville County, Idaho. It was built in 1976, so it is 49 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 160 vehicles a day, roughly 23% of them trucks, projected to reach 240 by 2042. The structure is 24 ft (7.3 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Jackknife Road over Jackknife Creek built?
It was built in 1976, making it 49 years old in 2025.
What condition is Jackknife Road over Jackknife 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 September 2024.
How much traffic does Jackknife Road over Jackknife Creek carry?
About 160 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is Jackknife Road over Jackknife Creek?
The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 34 ft wide.
Who owns Jackknife Road over Jackknife Creek?
It is owned by the County Highway Agency.