US 20 over High Line Canal
GoodCanyon County, Idaho · 5.6 E. Caldwell · Structure no. 000000000012250
- Built
- 1947
- 78 years old
- Condition
- Good
- inspected February 2023
- Type
- Frame
- Concrete
- Length
- 22 ft
- 1 main span
- Daily traffic
- 16,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 20 over High Line Canal is a concrete frame carrying US 20 over High Line Canal in Canyon County, Idaho. It was built in 1947, so it is 78 years old, older than the Idaho average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 16,000 vehicles a day, roughly 6% of them trucks, projected to reach 24,000 by 2042. The structure is 22 ft (6.7 m) long and 54 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 US 20 over High Line Canal built?
It was built in 1947, making it 78 years old in 2025.
What condition is US 20 over High Line Canal in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2023.
How much traffic does US 20 over High Line Canal carry?
About 16,000 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is US 20 over High Line Canal?
The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 54 ft wide.
Who owns US 20 over High Line Canal?
It is owned by the State Highway Agency.