IRR BIA RTE N4 over Polacca Wash
GoodNavajo County, Arizona · 24 MI West of JCT 191 · Structure no. 00000000000N541
- Built
- 1993
- 32 years old
- Condition
- Good
- inspected March 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 102 ft
- 1 main span
- Daily traffic
- 4,035
- 2023 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE N4 over Polacca Wash is a prestressed concrete box beam or girders - multiple carrying IRR BIA RTE N4 over Polacca Wash in Navajo County, Arizona. It was built in 1993, so it is 32 years old, younger 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 4,035 vehicles a day, roughly 10% of them trucks, projected to reach 4,721 by 2043. The structure is 102 ft (31.1 m) long and 32 ft wide. If it were closed, the detour would be 73.9 mi (119 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE N4 over Polacca Wash built?
It was built in 1993, making it 32 years old in 2025.
What condition is IRR BIA RTE N4 over Polacca Wash 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 March 2023.
How much traffic does IRR BIA RTE N4 over Polacca Wash carry?
About 4,035 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is IRR BIA RTE N4 over Polacca Wash?
The structure is 102 ft (31.1 m) long with a longest span of 97 ft (29.6 m) and a deck 32 ft wide.
Who owns IRR BIA RTE N4 over Polacca Wash?
It is owned by the Bureau of Indian Affairs.