Hanson County Bridge Report Card
Hanson County scores 67 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Hanson County, South Dakota
Hanson County has 62 bridges in the National Bridge Inventory, with 8 rated poor and 2 rated scour-critical. Its poor-condition share of 12.9% is at or below the 16.1% statewide average. Poor-condition bridges carry about 478 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Hanson County a Bridge Condition Exposure Score of 67/100 (D). The county has 62 bridges in the National Bridge Inventory, including 8 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 478 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 | 12.9% | 25.8 |
| Poor-condition traffic exposure | 25 | 0.7% of measured traffic | 0.5 |
| Scour-critical bridge share | 20 | 3.2% | 6.5 |
| Average age vs national baseline | 10 | 48 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 65,446 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 | 12.9% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.2% |
| Average Bridge Age | 48 years |
| Poor-Condition Traffic Exposure | 478 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Hanson County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| 25810 416 Avenue over James Rv | Poor condition + traffic exposure | Poor | 165 | 1959 |
| 25210 413 Avenue over Rock Ck | Poor condition + traffic exposure | Poor | 70 | 1983 |
| 25020 415 Avenue over Rock Ck | Poor condition + traffic exposure | Poor | 60 | 1967 |
| 41330 264 Street over Ck | Poor condition + traffic exposure | Poor | 45 | 1982 |
| 41440 267 Street over Twelve Mile Ck | Poor condition + traffic exposure | Poor | 45 | 1982 |
| 25170 415 Avenue over Ck | Poor condition + traffic exposure | Poor | 40 | 1984 |
| 41390 251 Street over Rock Ck | Poor condition + traffic exposure | Poor | 30 | 1963 |
| 314th AVE over Enemy Ck | Poor condition + traffic exposure | Poor | 23 | 2021 |
| Sd042 over North Br Twelve Mile Ck | Scour-critical foundation rating | Fair | 481 | 1958 |
| 41790 246 St. over Rock Ck | Scour-critical foundation rating | Fair | 35 | 1985 |
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.