Stc 6749; 2900N over Big Lost River
Butte County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Stc 6749; 2900N over Big Lost River in Butte 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 1926, making it 99 years old at the 2025 inventory.
- It carries about 260 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 22 of the 32 inventoried bridges in Butte County rated fair (68.8%); 1 (3.1%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2023, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (43.69628, -113.36528)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 39 ft |
| Location | 2.7 S. 0.2 E. Moore |
| NBI structure number | 000000000031525 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Butte County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over Inl Central Connector | 1993 | 4,400 | Fair |
| US 20 over Big Lost River | 1977 | 2,700 | Good |
| US 93 over Arco Canal | 1962 | 2,600 | Good |
| US 93 over Spring Creek | 1962 | 2,600 | Good |
| US 93 over Big Lost River | 1962 | 2,600 | Fair |
| US 93 over Big Lost River | 1958 | 2,300 | Fair |
All bridges nearby: Butte County, ID bridge conditions · every bridge in Butte County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.