IRR BIA RTE N6486
Carrying IRR BIA RTE N6486 over LAGUNA CREEK
3 MI EAST OF TSEGI, Navajo, Arizona
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
IRR BIA RTE N6486 in Navajo, Arizona sits above 2% of rated Arizona bridges on inventory load rating (21 t), while its 1965 build year is earlier than 66% of Navajo's recorded-year cohort (277 bridges).
IRR BIA RTE N6486 in Navajo, Arizona is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1965, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 2. The lowest applicable rating sets the federal condition category, so this Poor result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure AZ:00000000000N314
INTERSTATE-ERA · STEEL · SINGLE-SPAN · SUB-LED · LOCAL-ADT · STANDARD-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- STEEL Steel
- SINGLE-SPAN Single span
- SUB-LED Substructure-led
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard load
- CAT-POOR Poor
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: IRR BIA RTE N6486
The IRR BIA RTE N6486 bridge in Navajo, Arizona carries IRR BIA RTE N6486 over LAGUNA CREEK. It was built in 1965, making it 61 years old today. It was last reconstructed in 1976, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 10.4 meters (34 feet) end to end. Daily traffic averages 150 vehicles, placing it in the lower-traffic tier of Arizona bridges. It is owned and maintained by Bureau of Indian Affairs.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 2/9. The weakest component sits in critical condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed.
How IRR BIA RTE N6486 compares
Age against the county: built in 1965, earlier than 182 of Navajo's 277 bridges with a recorded construction year (66%), against a county median build year of 1972. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Arizona bridges with a recorded inventory load rating (8,572 of 8,573 rated).
IRR BIA RTE N6486 vs every rated Arizona bridge
Inventory load rating (metric tons), FHWA NBI, this state
21 Top 98% higher than 2% of 8,572 bridges
rated Arizona bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Navajo inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 277 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1965
- Last Reconstructed
- 1976
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 10.4 m (34 ft)
- Deck Width
- 3.7 m (12 ft)
- Owner
- Bureau of Indian Affairs
- Avg Daily Traffic
- 150 vehicles/day
- Structure Number
- 00000000000N314
Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 6/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • At 2/9, the substructure (piers and abutments) is in critical shape, with severe wear recorded for this vintage.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
IRR BIA RTE N6486 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 N6486 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 N6486?
IRR BIA RTE N6486 in Navajo, Arizona has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 2/9 on the FHWA's 0–9 scale.
How often is IRR BIA RTE N6486 inspected?
IRR BIA RTE N6486'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 150 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 N6486 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 N6486?
IRR BIA RTE N6486 has an NBI inventory load rating of 20.5 metric tons.
Who is responsible for maintaining IRR BIA RTE N6486?
IRR BIA RTE N6486 is owned and maintained by Bureau of Indian Affairs.
How old is IRR BIA RTE N6486 and does age affect safety?
IRR BIA RTE N6486 was built in 1965, making it 61 years old and last reconstructed in 1976.
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.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.