IRR BIA 170 over Gilson Wash
FairGila County, Arizona · Route 170 in San Carlos · Structure no. 0000H58616B1319
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected January 2024
- Type
- Slab
- Concrete Continuous
- Length
- 591 ft
- 20 main spans
- Daily traffic
- 7,500
- 2024 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA 170 over Gilson Wash is a concrete continuous slab carrying IRR BIA 170 over Gilson Wash in Gila County, Arizona. It was built in 1970, so it is 55 years old, older than the Arizona average of 47.8 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 7,500 vehicles a day, roughly 2% of them trucks, projected to reach 7,500 by 2044. The structure is 591 ft (180.1 m) long and 38 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA 170 over Gilson Wash built?
It was built in 1970, making it 55 years old in 2025.
What condition is IRR BIA 170 over Gilson Wash 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 January 2024.
How much traffic does IRR BIA 170 over Gilson Wash carry?
About 7,500 vehicles per day (2024 count), of which roughly 2% are trucks.
How long is IRR BIA 170 over Gilson Wash?
The structure is 591 ft (180.1 m) long with a longest span of 30 ft (9.2 m) and a deck 38 ft wide.
Who owns IRR BIA 170 over Gilson Wash?
It is owned by the Bureau of Indian Affairs.