IRR BIA RTE N4
Carrying IRR BIA RTE N4 over WEPO WASH
1 MI EAST OF PINON AZ, Navajo, Arizona
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: IRR BIA RTE N4
The IRR BIA RTE N4 bridge in Navajo, Arizona carries IRR BIA RTE N4 over WEPO WASH. It was built in 1990, making it 36 years old today. The structure is built primarily of concrete continuous and spans 4 sections, stretching 8.1 meters (27 feet) end to end. Daily traffic averages 4,078 vehicles, placing it in the moderately-trafficked tier of Arizona bridges. It is owned and maintained by Bureau of Indian Affairs.
The latest FHWA inspection records show culvert at 4/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules. Its NBI inventory load rating is 32.6 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How IRR BIA RTE N4 compares
Live comparison across Arizona.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1990
- Material
- Concrete Continuous
- Number of Spans
- 4
- Structure Length
- 8.1 m (27 ft)
- Deck Width
- 28.2 m (93 ft)
- Owner
- Bureau of Indian Affairs
- Avg Daily Traffic
- 4,078 vehicles/day
- Structure Number
- 00000000000N540
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
IRR BIA RTE N4 is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare IRR BIA RTE N4 against other structures in Navajo and across Arizona. Arizona bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for IRR BIA RTE N4?
IRR BIA RTE N4 in Navajo, Arizona on the FHWA's 0–9 scale.
How often is IRR BIA RTE N4 inspected?
IRR BIA RTE N4's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 4,078 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. IRR BIA RTE N4 is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for IRR BIA RTE N4?
IRR BIA RTE N4 has an NBI inventory load rating of 32.6 metric tons.
Who is responsible for maintaining IRR BIA RTE N4?
IRR BIA RTE N4 is owned and maintained by Bureau of Indian Affairs.
How old is IRR BIA RTE N4 and does age affect safety?
IRR BIA RTE N4 was built in 1990, making it 36 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.