IRR BIA RTE N59 over Blackhorse Wash
FairNavajo County, Arizona · 4MI North of Chilchinbito · Structure no. 00000000000N305
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected March 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 106 ft
- 3 main spans
- Daily traffic
- 1,189
- 2023 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE N59 over Blackhorse Wash is a prestressed concrete stringer/multi-beam or girder carrying IRR BIA RTE N59 over Blackhorse Wash in Navajo County, Arizona. It was built in 1969, so it is 56 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 1,189 vehicles a day, roughly 10% of them trucks, projected to reach 1,895 by 2043. The structure is 106 ft (32.2 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE N59 over Blackhorse Wash built?
It was built in 1969, making it 56 years old in 2025.
What condition is IRR BIA RTE N59 over Blackhorse 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 March 2023.
How much traffic does IRR BIA RTE N59 over Blackhorse Wash carry?
About 1,189 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is IRR BIA RTE N59 over Blackhorse Wash?
The structure is 106 ft (32.2 m) long with a longest span of 35 ft (10.6 m) and a deck 31 ft wide.
Who owns IRR BIA RTE N59 over Blackhorse Wash?
It is owned by the Bureau of Indian Affairs.