SH 34 over North Extension Canal
FairCaribou County, Idaho · 1.9 N. Grace · Structure no. 000000000014030
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected November 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 35 ft
- 1 main span
- Daily traffic
- 2,200
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 34 over North Extension Canal is a prestressed concrete box beam or girders - multiple carrying SH 34 over North Extension Canal in Caribou County, Idaho. It was built in 1978, so it is 47 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 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 2,200 vehicles a day, roughly 11% of them trucks, projected to reach 3,300 by 2042. The structure is 35 ft (10.7 m) long and 64 ft wide. If it were closed, the detour would be 29.8 mi (48 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 34 over North Extension Canal built?
It was built in 1978, making it 47 years old in 2025.
What condition is SH 34 over North Extension Canal 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 November 2024.
How much traffic does SH 34 over North Extension Canal carry?
About 2,200 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is SH 34 over North Extension Canal?
The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 64 ft wide.
Who owns SH 34 over North Extension Canal?
It is owned by the State Highway Agency.