8 Mile Road over Bear River
Caribou County, Idaho · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 8 Mile Road over Bear River in Caribou County, Idaho, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1972, making it 53 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 2 of the 45 inventoried bridges in Caribou County rated poor (4.4%); 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 April 2024, on a 12-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 poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.6083, -111.52047)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 3 | 3 | Serious condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 100 ft |
| Location | 3.2 S. 4.1 E.soda Springs |
| NBI structure number | 000000000023235 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
| Fracture critical (item 92A) | Yes |
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.