Irr Bia Rte 38 over Usbr 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 38 over Usbr Main Drain in La Paz County, Arizona, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1953, making it 72 years old at the 2025 inventory.
- It carries about 30 vehicles a day (traffic count year 2024).
- It is one of 10 of the 306 inventoried bridges in La Paz County rated poor (3.3%); 10 (3.3%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: substructure 6 to 7.
- Its most recent inspection on record is dated February 2024, on a 24-month routine inspection cycle.
- 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 → (33.89751, -114.50002)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 4 | 4 | Poor condition |
| Substructure | 6 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 59 ft |
| Location | 5 Km West Bia Rte 1 |
| NBI structure number | 00000000000H027 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | February 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Arizona department of transportation.
Busiest bridges in La Paz County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 10 EB and WB over Colorado River | 1960 | 60,000 | Good |
| SR 95 over Silver Creek | 1978 | 32,600 | Fair |
| I 10; EB & WB over Wash | 1949 | 27,198 | Good |
| I 10; EB & WB over Wash | 1949 | 27,198 | Fair |
| I 10; EB & WB over Italian Wash | 1953 | 25,941 | Good |
| I 10; WB over Wash | 1969 | 25,941 | Good |
All bridges nearby: La Paz County, AZ bridge conditions · every bridge in La Paz County · Arizona bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.