Fs Route 3099 over Cda River
Shoshone County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Fs Route 3099 over Cda River in Shoshone 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 1954, making it 71 years old at the 2025 inventory.
- It carries about 50 vehicles a day.
- It is one of 174 of the 261 inventoried bridges in Shoshone County rated fair (66.7%); 26 (10.0%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (47.97318, -116.20898)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel girder and floorbeam |
| Length | about 48 ft |
| Location | 15.5 Mi F/magee R.s. |
| NBI structure number | 010403000000009 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Shoshone County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Stc 5766;SILVERTON Ic | 1978 | 11,000 | Fair |
| I 90 EB & WB over S.fk.cda R;fr.rd. | 1978 | 11,000 | Fair |
| I 90 over S.fk.coeur Dalene River | 1987 | 11,000 | Fair |
| I 90 Ebl & Wbl over Crossroad Bd;w.wallace I | 1987 | 11,000 | Fair |
| I 90 over I 90B;CANYON CR | 1991 | 11,000 | Fair |
| I 90 Spur over Canyon Creek | 1940 | 10,500 | Fair |
All bridges nearby: Shoshone County, ID bridge conditions · every bridge in Shoshone County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.