US 12 over Clearwater R.(kamiah Br)
Lewis County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 12 over Clearwater R.(kamiah Br) in Lewis 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 1998, making it 27 years old at the 2025 inventory.
- It carries about 4,700 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 8 of the 21 inventoried bridges in Lewis County rated fair (38.1%); 1 (4.8%) 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 February 2023, 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 → (46.23029, -116.01873)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 671 ft |
| Location | In Kamiah |
| NBI structure number | 000000000010426 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | February 2023 |
| 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 Idaho department of transportation.
Busiest bridges in Lewis County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 95 over Lapwai Creek | 2019 | 3,600 | Good |
| US 95 over Lapwai Creek | 2019 | 3,600 | Good |
| US 95 over Lapwai Creek | 2019 | 3,600 | Good |
| US 95 over Lapwai Creek | 2019 | 3,600 | Good |
| US 95 over Lapwai Creek | 2019 | 3,600 | Good |
| US 95 over Lapwai Creek | 2020 | 3,600 | Good |
All bridges nearby: Lewis County, ID bridge conditions · every bridge in Lewis County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.