Bridge conditions in Bonneville County, Idaho
213 inventoried bridges · 3 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 213 bridges in Bonneville County: 69 rated good, 141 fair, and 3 poor.
- 3 of the 213 bridges in Bonneville County, Idaho, are rated in poor condition (1.4%) in the 2025 National Bridge Inventory, as of .
- 69 bridges (32.4%) are rated good and 141 (66.2%) fair.
- The median Bonneville County bridge was built in 1971.
- The busiest poor-rated bridge is S 25 E; S Hitt Rd over Sand Creek (built 1994), carrying about 27,500 vehicles a day.
Good 32.4% · Fair 66.2% · Poor 1.4% of 213 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 |
|---|---|---|---|
| S 25 E; S Hitt Rd over Sand Creek | 1994 | 27,500 | Poor |
| STP7046;LINCOLN Rd over Idaho Canal | 1984 | 18,000 | Poor |
| N 45TH E over Sand Creek | 1957 | 2,100 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over Porter Canal | 1966 | 38,000 | Fair |
| US 20 Ebl & Wbl over Snake R.;johns Hole Br. | 1966 | 38,000 | Fair |
| US 20 over Sma 7096;RIVERSIDE Dr.ic | 1969 | 38,000 | Fair |
| US 20 over Sage Canal | 1970 | 34,500 | Fair |
| US 20 over UPRR | 1966 | 32,000 | Fair |
| US 20 Wbl & Ebl over Sma 7076;LINDSAY Blvd.ic | 1966 | 32,000 | Fair |
| Stp 7446;SUNNYSIDE over Idaho Canal | 2004 | 32,000 | Fair |
| Stp 7446;SUNNYSIDE over Sand Creek | 2002 | 30,000 | Good |
| S 25 E; S Hitt Rd over Sand Creek | 1994 | 27,500 | Poor |
| US 20 over Willow Creek | 1970 | 27,000 | 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.