Bridge Condition Trends in South Dakota
Between 2015 and 2025, bridge conditions in South Dakota have improved. The share of bridges rated poor went from 18.2% to 16.1% — a change of -2.1 percentage points.
Condition Summary
| Year | Total | Good | Fair | Poor | Poor % |
|---|---|---|---|---|---|
| 2015 | 5,865 | 1,901 | 2,898 | 1,066 | 18.2% |
| 2020 | 5,880 | 1,946 | 2,896 | 1,038 | 17.7% |
| 2025 | 5,883 | 2,038 | 2,900 | 945 | 16.1% |
Most Improved Counties in South Dakota
| County | Poor % (2015) | Poor % (2025) | Change |
|---|---|---|---|
| Clark | 36.8% | 4.8% | -32.1 pp |
| Jones | 22.2% | 5.4% | -16.8 pp |
| Lincoln | 28.7% | 15.5% | -13.3 pp |
| Hyde | 34.8% | 21.7% | -13.0 pp |
| Harding | 14.3% | 2.0% | -12.2 pp |
| Lake | 15.2% | 5.1% | -10.1 pp |
| Hamlin | 21.1% | 11.5% | -9.6 pp |
| McCook | 16.5% | 7.1% | -9.4 pp |
| Sully | 28.6% | 19.4% | -9.2 pp |
| Fall River | 15.2% | 6.2% | -8.9 pp |
Counties Where Conditions Worsened
| County | Poor % (2015) | Poor % (2025) | Change |
|---|---|---|---|
| Marshall | 16.7% | 34.2% | +17.5 pp |
| Faulk | 6.8% | 23.9% | +17.1 pp |
| Spink | 19.4% | 30.1% | +10.7 pp |
| Union | 13.8% | 24.3% | +10.5 pp |
| Douglas | 6.8% | 15.9% | +9.1 pp |
| Brule | 0.0% | 7.9% | +7.9 pp |
| Codington | 10.8% | 18.7% | +7.9 pp |
| Brookings | 15.4% | 22.8% | +7.5 pp |
| Bon Homme | 21.3% | 27.0% | +5.7 pp |
| Stanley | 11.1% | 16.2% | +5.1 pp |