I 15 Nbl over Porter Canal
FairBonneville County, Idaho · 2.0 S. Idaho Falls · Structure no. 000000000011705
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected November 2024
- Type
- Frame
- Concrete
- Length
- 26 ft
- 1 main span
- Daily traffic
- 12,750
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 Nbl over Porter Canal is a concrete frame carrying I 15 Nbl over Porter Canal in Bonneville County, Idaho. It was built in 1962, so it is 63 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 12,750 vehicles a day, roughly 19% of them trucks, projected to reach 19,125 by 2042. The structure is 26 ft (7.9 m) long and 48 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 I 15 Nbl over Porter Canal built?
It was built in 1962, making it 63 years old in 2025.
What condition is I 15 Nbl over Porter 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 I 15 Nbl over Porter Canal carry?
About 12,750 vehicles per day (2023 count), of which roughly 19% are trucks.
How long is I 15 Nbl over Porter Canal?
The structure is 26 ft (7.9 m) long with a longest span of 26 ft (7.9 m) and a deck 48 ft wide.
Who owns I 15 Nbl over Porter Canal?
It is owned by the State Highway Agency.