Irr Bia Rte 904 over Owyhee River
Owyhee County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte 904 over Owyhee River in Owyhee County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1987, making it 38 years old at the 2025 inventory.
- It carries about 20 vehicles a day (traffic count year 2024).
- It is one of 29 of the 49 inventoried bridges in Owyhee County rated fair (59.2%); 4 (8.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (deck 7 to 5).
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (42.03364, -116.21939)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 5 | Fair condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 119 ft |
| Location | 17.4 Km NW of Owyhee |
| NBI structure number | 00000000000H311 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Owyhee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 95 over Snake River;homedale Br. | 1969 | 11,000 | Fair |
| SH 55 over Snake River (marsing Br) | 2020 | 7,500 | Fair |
| US 95 over B Line Canal | 1982 | 3,600 | Good |
| US 95 over Jump Creek | 1982 | 3,200 | Good |
| SH 19 over Succor Creek | 2017 | 2,500 | Good |
| SH 45 over Snake R.(walters Ferry) | 1972 | 1,900 | Fair |
All bridges nearby: Owyhee County, ID bridge conditions · every bridge in Owyhee County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.