Todd County Bridge Report Card
Todd County scores 30 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Todd County, South Dakota
Todd County has 27 bridges in the National Bridge Inventory, with 7 rated poor and 1 rated scour-critical. Its poor-condition share of 25.9% is above the 16.1% statewide average. Poor-condition bridges carry about 5,256 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Todd County a Bridge Condition Exposure Score of 30/100 (F). The county has 27 bridges in the National Bridge Inventory, including 7 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 5,256 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 | 25.9% | 40.0 |
| Poor-condition traffic exposure | 25 | 30.6% of measured traffic | 23.0 |
| Scour-critical bridge share | 20 | 3.7% | 7.4 |
| Average age vs national baseline | 10 | 35 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 17,176 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 | 25.9% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.7% |
| Average Bridge Age | 35 years |
| Poor-Condition Traffic Exposure | 5,256 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Todd County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Hidden Timber Road over Antelope Ck | Poor condition + traffic exposure | Poor | 128 | 1951 |
| IRR BIA RTE 7 over Little White River | Poor condition + traffic exposure | Poor | 1,851 | 1972 |
| IRR BIA RTE 5 over Little White River | Poor condition + traffic exposure | Poor | 1,050 | 1967 |
| IRR BIA RTE 5 over Little White River | Poor condition + traffic exposure | Poor | 1,050 | 1967 |
| IRR BIA RTE 5 over Little White River | Poor condition + traffic exposure | Poor | 1,019 | 1965 |
| IRR BIA RTE 11 over Rosebud Creek | Poor condition + traffic exposure | Poor | 114 | 1971 |
| IRR BIA RTE 3 over Little White River | Poor condition + traffic exposure | Poor | 44 | 1964 |
| IRR Us083 over Antelope Ck | High traffic | Fair | 2,544 | 1981 |
| Main Street over Antelope Ck | High traffic | Fair | 1,400 | 1978 |
| IRR Us018 over Little White Rv | High traffic | Fair | 1,340 | 1989 |
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.