Bridge Condition Trends in Idaho
Between 2015 and 2025, bridge conditions in Idaho have improved. The share of bridges rated poor went from 7.9% to 5.4% — a change of -2.5 percentage points.
Condition Summary
| Year | Total | Good | Fair | Poor | Poor % |
|---|---|---|---|---|---|
| 2015 | 4,369 | 1,199 | 2,827 | 343 | 7.9% |
| 2020 | 4,522 | 1,312 | 2,924 | 286 | 6.3% |
| 2025 | 4,646 | 1,468 | 2,928 | 250 | 5.4% |
Most Improved Counties in Idaho
| County | Poor % (2015) | Poor % (2025) | Change |
|---|---|---|---|
| Franklin | 20.0% | 8.7% | -11.3 pp |
| Teton | 16.1% | 5.4% | -10.7 pp |
| Clark | 17.6% | 12.8% | -4.8 pp |
| Madison | 4.5% | 0.0% | -4.5 pp |
| Adams | 13.7% | 9.2% | -4.5 pp |
| Lewis | 9.1% | 4.8% | -4.3 pp |
| Fremont | 9.8% | 5.8% | -4.0 pp |
| Bonneville | 5.3% | 1.4% | -3.9 pp |
| Nez Perce | 7.6% | 4.2% | -3.4 pp |
| Latah | 4.0% | 0.8% | -3.2 pp |