Timberline Road over E. Fk. Wood River
Blaine County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Timberline Road over E. Fk. Wood River in Blaine 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 1920 and reconstructed in 1950, making it 105 years old at the 2025 inventory.
- It carries about 40 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 65 of the 96 inventoried bridges in Blaine County rated fair (67.7%); 4 (4.2%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 5 to 6, superstructure 5 to 6.
- Its most recent inspection on record is dated September 2024, 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 → (43.60319, -114.32997)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 6 | Satisfactory condition |
| Superstructure | 5 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel girder and floorbeam |
| Length | about 41 ft |
| Location | 1.1 E Gimlet |
| NBI structure number | 000000000023743 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Blaine County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 75 over Big Wood River | 2002 | 14,500 | Good |
| SH 75 over Big Wood River | 2017 | 14,500 | Fair |
| SH 75 over Bellevue Canal | 1931 | 7,000 | Fair |
| STC2815;WARM Sprng over Big Wood River | 1972 | 6,300 | Fair |
| Dollar Road over Trail Creek | 1988 | 5,000 | Good |
| SH 75 over Richfield Canal | 1955 | 4,500 | Fair |
All bridges nearby: Blaine County, ID bridge conditions · every bridge in Blaine County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.