Bridge conditions in Adams County, Idaho
87 inventoried bridges · 8 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 87 bridges in Adams County: 27 rated good, 52 fair, and 8 poor.
- 8 of the 87 bridges in Adams County, Idaho, are rated in poor condition (9.2%) in the 2025 National Bridge Inventory, as of .
- 27 bridges (31.0%) are rated good and 52 (59.8%) fair.
- The median Adams County bridge was built in 1974.
- The busiest poor-rated bridge is Old Hornet Road over Hornet Creek (built 1949), carrying about 100 vehicles a day.
Good 31.0% · Fair 59.8% · Poor 9.2% of 87 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Old Hornet Road over Hornet Creek | 1949 | 100 | Poor |
| Middle Fork Road over M.fk.weiser River | 1957 | 70 | Poor |
| Jackson Creek Rd over Weiser River | 1988 | 50 | Poor |
| No Data Entered over Boulder Creek | 1957 | 50 | Poor |
| Wildhorse Road over Wildhorse River | 1908 | 30 | Poor |
| Old Hwy 95 over Little Salmon River | 1923 | 20 | Poor |
| Airport Rd over Weiser River | 1982 | 20 | Poor |
| Cemetary Rd over Bear Creek | 1983 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 95 over Little Salmon River | 2021 | 3,300 | Good |
| US 95 over W.fk.goose Creek | 1978 | 3,300 | Fair |
| US 95 over E.fk.goose Creek | 1978 | 3,300 | Fair |
| US 95 over Little Salmon River | 2019 | 3,100 | Good |
| US 95 over M.fk.weiser River | 1974 | 2,900 | Fair |
| US 95 over Cottonwood Creek | 2017 | 2,900 | Good |
| US 95 over Lester Creek | 2017 | 2,900 | Good |
| US 95 over Mud Creek | 2017 | 2,700 | Good |
| US 95 over Boulder Creek | 2002 | 2,600 | Fair |
| US 95 over Fall Creek | 2001 | 2,600 | 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.