US 91 over Cub River
FairFranklin County, Idaho · 0.6 N. Franklin · Structure no. 000000000017456
- Built
- 2006
- 19 years old
- Condition
- Fair
- inspected July 2022
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 74 ft
- 1 main span
- Daily traffic
- 8,600
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 91 over Cub River is a prestressed concrete stringer/multi-beam or girder carrying US 91 over Cub River in Franklin County, Idaho. It was built in 2006, so it is 19 years old, younger 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 8,600 vehicles a day, roughly 8% of them trucks, projected to reach 12,900 by 2042. The structure is 74 ft (22.6 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 91 over Cub River built?
It was built in 2006, making it 19 years old in 2025.
What condition is US 91 over Cub 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 July 2022.
How much traffic does US 91 over Cub River carry?
About 8,600 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is US 91 over Cub River?
The structure is 74 ft (22.6 m) long with a longest span of 72 ft (21.9 m) and a deck 72 ft wide.
Who owns US 91 over Cub River?
It is owned by the State Highway Agency.