Irr Bia Rte 31 over Southern Pacific RR
Yuma County, Arizona · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte 31 over Southern Pacific RR in Yuma County, Arizona, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1965, making it 60 years old at the 2025 inventory.
- It carries about 3,550 vehicles a day (traffic count year 2024).
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (32.72982, -114.61558)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 4 | Poor condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 117 ft |
| Location | In Fort Yuma Sub-agency |
| NBI structure number | 00000000000H050 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Arizona department of transportation.
All bridges nearby: Yuma County, AZ bridge conditions · Arizona bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.