SH 34 over Uprr;sodas 3RD E.st Op
Caribou County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 34 over Uprr;sodas 3RD E.st Op 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 1978, making it 47 years old at the 2025 inventory.
- It carries about 5,600 vehicles a day (traffic count year 2023).
- Its listed owner is the state 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 class is unchanged from 2024 (fair), but component ratings moved: superstructure 7 to 8, substructure 7 to 8.
- Its most recent inspection on record is dated October 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 → (42.65681, -111.59481)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 8 | Very good condition |
| Substructure | 7 | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 79 ft |
| Location | In Soda SPRINGS;3RD E.st |
| NBI structure number | 000000000014035 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
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 |
|---|---|---|---|
| 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 |
| SH 34 over Little 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.