Irr Bia Rte 1 over Main Drain
La Paz County, Arizona · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte 1 over Main Drain in La Paz County, Arizona, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1962, making it 63 years old at the 2025 inventory.
- It carries about 3,000 vehicles a day (traffic count year 2021).
- 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 → (34.09115, -114.38997)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 7 | Good condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Concrete stringer or multi-beam girder |
| Length | about 75 ft |
| Location | 0.7 Km N of Bia 1/10 Int. |
| NBI structure number | 00000000000H004 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Arizona department of transportation.
All bridges nearby: La Paz County, AZ bridge conditions · Arizona bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.