US 70 over Backfield Canyon
GoodGreenlee County, Arizona · 0.9 MI W JCT SR 75 · Structure no. 04328
- Built
- 1952
- 73 years old
- Condition
- Good
- inspected July 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 32 ft
- 3 main spans
- Daily traffic
- 1,052
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
US 70 over Backfield Canyon is a concrete continuous culvert carrying US 70 over Backfield Canyon in Greenlee County, Arizona. It was built in 1952, so it is 73 years old, older than the Arizona average of 47.8 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 1,052 vehicles a day, roughly 20% of them trucks, projected to reach 1,062 by 2041. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 14.9 mi (24 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 70 over Backfield Canyon built?
It was built in 1952, making it 73 years old in 2025.
What condition is US 70 over Backfield Canyon 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 July 2023.
How much traffic does US 70 over Backfield Canyon carry?
About 1,052 vehicles per day (2021 count), of which roughly 20% are trucks.
How long is US 70 over Backfield Canyon?
The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m).
Who owns US 70 over Backfield Canyon?
It is owned by the State Highway Agency.