Anderson Road over N. Extension Canal
Caribou County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Anderson Road over N. Extension Canal in Caribou 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 2002, making it 23 years old at the 2025 inventory.
- It carries about 50 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 31 of the 45 inventoried bridges in Caribou County rated fair (68.9%); 2 (4.4%) 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 September 2022, on a 48-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 → (42.60744, -111.79858)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete frame |
| Length | about 24 ft |
| Location | 2.1 N 3.5 W Grace |
| NBI structure number | 000000000023266 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2022 |
| Inspection interval (item 91) | 48 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 Caribou County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 34 over Uprr;sodas 3RD E.st Op | 1978 | 5,600 | Fair |
| US 30 over UPRR; Soda Springs Op | 1988 | 3,500 | Fair |
| SH 34 over Bear River;grace Bridge | 1974 | 2,200 | Fair |
| SH 34 over North Extension Canal | 1978 | 2,200 | Fair |
| Blackfoot River Rd over Blackfoot River | 1980 | 1,000 | Good |
| SH 34 over Blackfoot River | 1979 | 770 | Fair |
All bridges nearby: Caribou County, ID bridge conditions · every bridge in Caribou County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.