McCook County Bridge Report Card
McCook County scores 75 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
McCook County, South Dakota
McCook County has 98 bridges in the National Bridge Inventory, with 7 rated poor and 5 rated scour-critical. Its poor-condition share of 7.1% is at or below the 16.1% statewide average. Poor-condition bridges carry about 702 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives McCook County a Bridge Condition Exposure Score of 75/100 (C). The county has 98 bridges in the National Bridge Inventory, including 7 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 702 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 | 7.1% | 14.3 |
| Poor-condition traffic exposure | 25 | 0.8% of measured traffic | 0.6 |
| Scour-critical bridge share | 20 | 5.1% | 10.2 |
| Average age vs national baseline | 10 | 47 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 88,966 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 | 7.1% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.1% |
| Average Bridge Age | 47 years |
| Poor-Condition Traffic Exposure | 702 vehicles/day |
Bridges to Watch
Top Bridges to Watch in McCook County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| 445 AVE (fas 6355) over I090 | Poor condition + traffic exposure | Poor | 328 | 1964 |
| 448th Avenue over Little Vermillion River | Poor condition + traffic exposure | Poor | 173 | 1940 |
| 451st Avenue over Trib. To E Fork Verm Rv | Poor condition + traffic exposure | Poor | 66 | 1930 |
| 433rd Avenue over Tributary To Wolf Creek | Poor condition + traffic exposure | Poor | 50 | 1977 |
| 439th Avenue over W. Fork Of Vermillion Rv | Poor condition + traffic exposure | Poor | 45 | 1961 |
| 263rd Street over Wolf Creek | Poor condition + traffic exposure | Poor | 35 | 1961 |
| 248th Street over W. Fork Of Vermillion Rv | Poor condition + traffic exposure | Poor | 5 | 1917 |
| Sd038 over East Fork Vermillion Rv | Scour-critical foundation rating | Fair | 1,768 | 1947 |
| Sd262 over Wolf Ck | Scour-critical foundation rating | Fair | 749 | 1937 |
| Sd042 over Wolf Ck | Scour-critical foundation rating | Fair | 361 | 1957 |
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.