505-3330e over Grays Lake Outlet
Bingham County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 505-3330e over Grays Lake Outlet in Bingham County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1947 and reconstructed in 1988, making it 78 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 210 of the 263 inventoried bridges in Bingham County rated fair (79.8%); 9 (3.4%) 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 → (43.26841, -111.64358)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 7 | Good condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 32 ft |
| Location | 2.4 S. 27.7 E. Firth |
| NBI structure number | 000000000023055 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Bingham County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 15 Nbl & Sbl over Ross Fork Creek | 2023 | 29,000 | Good |
| I 15 over Riverside Canal | 2019 | 26,000 | Good |
| US 26 Ebl & Wbl over Snake River;w.blackfoot | 1965 | 18,000 | Fair |
| I 15 Nbl over Aberdeen Springfield Cnl | 1962 | 14,250 | Fair |
| I 15 Sbl over Aberdeen Springfield Cnl | 1962 | 14,250 | Fair |
| I 15 Nbl over Peoples Canal | 1962 | 14,250 | Fair |
All bridges nearby: Bingham County, ID bridge conditions · every bridge in Bingham County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.