SH 27 over B-4 Canal
Minidoka County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 27 over B-4 Canal in Minidoka County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1963, making it 62 years old at the 2025 inventory.
- It carries about 8,700 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 45 of the 67 inventoried bridges in Minidoka County rated fair (67.2%); 1 (1.5%) are rated poor.
- 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 → (42.59, -113.78361)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 36 ft |
| Location | 1.0 S. Paul |
| NBI structure number | 000000000013345 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Minidoka County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I84 Ebl Wbl over B-4 Canal | 2024 | 22,000 | Good |
| I 84 Ebl over Shodde Road Gs | 1966 | 11,000 | Fair |
| I 84 Wbl over Shodde Road Gs | 1966 | 11,000 | Fair |
| I 84 Ebl over B-4 Canal | 1966 | 11,000 | Fair |
| I 84 Ebl over I 84B;UPRR;HEYBURN Ic | 1961 | 10,500 | Fair |
| I 84 Wbl over I 84B;UPRR;HEYBURN Ic | 1961 | 10,500 | Fair |
All bridges nearby: Minidoka County, ID bridge conditions · every bridge in Minidoka County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.