Bridge conditions in Blaine County, Idaho
96 inventoried bridges · 4 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Blaine County tracks close to typical: 4 of its 96 inventoried bridges (4.2%) are rated poor, against a national rate of about 7%.
- 4 of the 96 bridges in Blaine County, Idaho, are rated in poor condition (4.2%) in the 2025 National Bridge Inventory, as of .
- 27 bridges (28.1%) are rated good and 65 (67.7%) fair.
- The median Blaine County bridge was built in 1978.
- The busiest poor-rated bridge is Kilpatrick Br. Rd. over Silver Creek (built 1978), carrying about 60 vehicles a day.
Good 28.1% · Fair 67.7% · Poor 4.2% of 96 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 |
|---|---|---|---|
| Kilpatrick Br. Rd. over Silver Creek | 1978 | 60 | Poor |
| Fdr over North Fork of Wood River | 1955 | 50 | Poor |
| Pr over North Fork Wood River | 1950 | 50 | Poor |
| Old Highway 93 over Richfield Canal | 1932 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 75 over Big Wood River | 2002 | 14,500 | Good |
| SH 75 over Big Wood River | 2017 | 14,500 | Fair |
| SH 75 over Bellevue Canal | 1931 | 7,000 | Fair |
| STC2815;WARM Sprng over Big Wood River | 1972 | 6,300 | Fair |
| Dollar Road over Trail Creek | 1988 | 5,000 | Good |
| SH 75 over Richfield Canal | 1955 | 4,500 | Fair |
| US 93 over Little Wood River | 1977 | 2,900 | Fair |
| US 93 over Little Wood River | 1977 | 2,900 | Fair |
| STC2818;E Fork Rd over Big Wood River | 1974 | 2,800 | Fair |
| SH 75 over Big Wood River | 1991 | 2,400 | 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.