Sublett Road over I 84 Eb-wb;sublett Rd Ic
Cassia County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sublett Road over I 84 Eb-wb;sublett Rd Ic in Cassia County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1967 and reconstructed in 1981, making it 58 years old at the 2025 inventory.
- It carries about 300 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 93 of the 117 inventoried bridges in Cassia County rated fair (79.5%); 0 (0.0%) 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 2023, 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 → (42.32775, -113.21358)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 312 ft |
| Location | at Sublett |
| NBI structure number | 000000000024255 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| 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 Cassia County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 84B over Snake River;overland Br | 2001 | 26,000 | Fair |
| I 86 Ebl over I 84 Wbl | 2020 | 19,000 | Good |
| I 84B Sbl over Snake River;heyburn Br. | 1977 | 17,000 | Fair |
| I 84B Nbl over Snake River;heyburn Br. | 1955 | 15,000 | Fair |
| SH 77 over Canal | 1985 | 13,000 | Fair |
| I 84 over Co.rd.;horse Butte Gs | 1963 | 11,500 | Fair |
All bridges nearby: Cassia County, ID bridge conditions · every bridge in Cassia County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.