Turner County Bridge Report Card
Turner County scores 43 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Turner County, South Dakota
Turner County has 143 bridges in the National Bridge Inventory, with 38 rated poor and 8 rated scour-critical. Its poor-condition share of 26.6% is above the 16.1% statewide average. Poor-condition bridges carry about 4,377 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Turner County a Bridge Condition Exposure Score of 43/100 (F). The county has 143 bridges in the National Bridge Inventory, including 38 in poor condition and 8 rated scour-critical. Poor-condition bridges carry about 4,377 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 26.6% | 40.0 |
| Poor-condition traffic exposure | 25 | 8.4% of measured traffic | 6.3 |
| Scour-critical bridge share | 20 | 5.6% | 11.2 |
| Average age vs national baseline | 10 | 42 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 52,091 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 26.6% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.6% |
| Average Bridge Age | 42 years |
| Poor-Condition Traffic Exposure | 4,377 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Turner County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| 45520 275 ST over West Fork Vermillion Rv | Poor condition + traffic exposure | Poor | 758 | 1952 |
| 45650 275 ST over East Fork Vermillion Rv | Poor condition + traffic exposure | Poor | 747 | 1958 |
| 46220 275 ST over Long Ck | Poor condition + traffic exposure | Poor | 570 | 1977 |
| 46350 291 St. over Vermillion Rv | Poor condition + traffic exposure | Poor | 283 | 1966 |
| 28650 461 AVE over Vermillion Rv | Poor condition + traffic exposure | Poor | 207 | 1956 |
| 27150 446 AVE over Ck | Poor condition + traffic exposure | Poor | 100 | 1945 |
| 27220 444 AVE over Ck | Poor condition + traffic exposure | Poor | 100 | 1950 |
| 27130 445 AVE over Ck | Poor condition + traffic exposure | Poor | 100 | 1950 |
| 29020 453 AVE over Ck | Poor condition + traffic exposure | Poor | 100 | 1999 |
| 29610 457 AVE over Ck | Poor condition + traffic exposure | Poor | 97 | 1945 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.