Bridge conditions in Cassia County, Idaho
117 inventoried bridges · 0 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Cassia County is one of the counties with a clean sheet: 117 bridges on the federal inventory and not one rated poor. 93 carry a fair rating, which means wear worth watching but no structural deficiency.
- 0 of the 117 bridges in Cassia County, Idaho, are rated in poor condition (0.0%) in the 2025 National Bridge Inventory, as of .
- 24 bridges (20.5%) are rated good and 93 (79.5%) fair.
- The median Cassia County bridge was built in 1978.
Good 20.5% · Fair 79.5% · Poor 0.0% of 117 bridges
Bridges rated poor
No bridges in this county carry a poor rating in the current inventory.
Busiest bridges in the 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 |
| I 84 over Juniper Rd;gs NO.1 | 1968 | 11,000 | Fair |
| I 84 over Juniper Rd;gs NO.2 | 1968 | 11,000 | Fair |
| I 84 over Meadow Creek | 1968 | 11,000 | Fair |
| I 84 Ebl over Southside Canal | 1960 | 9,500 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Idaho: Idaho bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.