IRR BIA ROUTE 1
Carrying IRR BIA ROUTE 1 over TYSON WATERWAY
1.6 KM S OF BIA 1/56 INT., La Paz, Arizona
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
IRR BIA ROUTE 1 in La Paz, Arizona sits above 4% of rated Arizona bridges on inventory load rating (22 t), while its 1958 build year is earlier than 65% of La Paz's recorded-year cohort (306 bridges).
IRR BIA ROUTE 1 in La Paz, Arizona is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1958, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair 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:00000000000H008
INTERSTATE-ERA · CONCRETE · MULTI-SPAN · TIED-CTRL · ARTERIAL-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- CONCRETE Concrete
- MULTI-SPAN 3 spans
- TIED-CTRL Tied control
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
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 ROUTE 1
The IRR BIA ROUTE 1 bridge in La Paz, Arizona carries IRR BIA ROUTE 1 over TYSON WATERWAY. It was built in 1958, making it 68 years old today. The structure is built primarily of concrete continuous and spans 3 sections, stretching 28.4 meters (93 feet) end to end. Daily traffic averages 1,700 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 a deck rating of 6/9, superstructure at 6/9, substructure at 7/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How IRR BIA ROUTE 1 compares
Age against the county: built in 1958, earlier than 199 of La Paz's 306 bridges with a recorded construction year (65%), against a county median build year of 1967. 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 ROUTE 1 vs every rated Arizona bridge
Inventory load rating (metric tons), FHWA NBI, this state
22 Top 96% higher than 4% 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.
La Paz inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 306 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
- 1958
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 28.4 m (93 ft)
- Deck Width
- 9.4 m (31 ft)
- Owner
- Bureau of Indian Affairs
- Avg Daily Traffic
- 1,700 vehicles/day
- Structure Number
- 00000000000H008
Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether IRR BIA ROUTE 1 is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare IRR BIA ROUTE 1 against other structures in La Paz 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 ROUTE 1?
IRR BIA ROUTE 1 in La Paz, Arizona has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is IRR BIA ROUTE 1 inspected?
IRR BIA ROUTE 1'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 1,700 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. IRR BIA ROUTE 1 is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for IRR BIA ROUTE 1?
IRR BIA ROUTE 1 has an NBI inventory load rating of 22.0 metric tons.
Who is responsible for maintaining IRR BIA ROUTE 1?
IRR BIA ROUTE 1 is owned and maintained by Bureau of Indian Affairs.
How old is IRR BIA ROUTE 1 and does age affect safety?
IRR BIA ROUTE 1 was built in 1958, making it 68 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.
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.