Walworth County Bridge Report Card
Walworth County scores 85 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Walworth County, South Dakota
Walworth County has 33 bridges in the National Bridge Inventory, with 1 rated poor and 1 rated scour-critical. Its poor-condition share of 3.0% is at or below the 16.1% statewide average. Poor-condition bridges carry about 183 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Walworth County a Bridge Condition Exposure Score of 85/100 (B). The county has 33 bridges in the National Bridge Inventory, including 1 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 183 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 | 3.0% | 6.1 |
| Poor-condition traffic exposure | 25 | 1.0% of measured traffic | 0.7 |
| Scour-critical bridge share | 20 | 3.0% | 6.1 |
| Average age vs national baseline | 10 | 53 years vs 48 nationally | 2.2 |
| Traffic-data completeness | 5 | 19,049 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 | 3.0% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.0% |
| Average Bridge Age | 53 years |
| Poor-Condition Traffic Exposure | 183 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Walworth County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| S. 1st Avenue over Creek | Poor condition + traffic exposure | Poor | 183 | 1930 |
| 132nd Street over Creek | Scour-critical foundation rating | Fair | 129 | 1959 |
| Us012 over Burlington Northern Rr | High traffic | Good | 2,111 | 1969 |
| Us012 over Ck | High traffic | Good | 2,111 | 1969 |
| IRR Ar Us012 over Burlington Northern Rr | High traffic | Fair | 2,071 | 1957 |
| IRR Us012 over Missouri Rv (oahe Lk) | High traffic | Fair | 2,071 | 1959 |
| Us012 over Blue Blanket Ck | High traffic | Fair | 1,963 | 1964 |
| Us012 over Ck | High traffic | Fair | 1,544 | 1965 |
| Us012 Wf over Ck | High traffic | Fair | 1,374 | 1965 |
| Us012 over Spring Lk | High traffic | Good | 1,145 | 1986 |
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.