County Line Road over Noble Canal
Gem County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Line Road over Noble Canal in Gem County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1966, making it 59 years old at the 2025 inventory.
- It carries about 170 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 40 of the 57 inventoried bridges in Gem County rated fair (70.2%); 3 (5.3%) 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 → (43.90278, -116.71233)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 24 ft |
| Location | 0.6 N. 3.2 W. Letha |
| NBI structure number | 000000000028095 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Gem County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 16 over Black Canyon Canal | 1966 | 12,000 | Fair |
| SH 52 over Farmers Coop Canal | 1992 | 11,500 | Good |
| SH 52 over Payette River;emmett Br. | 1971 | 10,500 | Fair |
| SH 52 over Farmers Coop Canal | 2001 | 7,000 | Good |
| SMA7190;SUBSTATION over Last Chance Canal | 2016 | 6,800 | Good |
| SH 52 over Drain Ditch | 1988 | 3,500 | Fair |
All bridges nearby: Gem County, ID bridge conditions · every bridge in Gem County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.