Roberts County Bridge Report Card
Roberts County scores 49 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Roberts County, South Dakota
Roberts County has 158 bridges in the National Bridge Inventory, with 40 rated poor and 6 rated scour-critical. Its poor-condition share of 25.3% is above the 16.1% statewide average. Poor-condition bridges carry about 2,666 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Roberts County a Bridge Condition Exposure Score of 49/100 (F). The county has 158 bridges in the National Bridge Inventory, including 40 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 2,666 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 | 25.3% | 40.0 |
| Poor-condition traffic exposure | 25 | 1.7% of measured traffic | 1.2 |
| Scour-critical bridge share | 20 | 3.8% | 7.6 |
| Average age vs national baseline | 10 | 54 years vs 48 nationally | 2.4 |
| Traffic-data completeness | 5 | 160,346 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 | 25.3% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.8% |
| Average Bridge Age | 54 years |
| Poor-Condition Traffic Exposure | 2,666 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Roberts County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| IRR Sd127 over Big Slough Ck | Poor condition + traffic exposure | Poor | 354 | 1955 |
| IRR Sd127 over Little Minnesota Rv | Poor condition + traffic exposure | Poor | 872 | 1953 |
| 105 ST over Bois De Sioux R | Poor condition + traffic exposure | Poor | 200 | 1930 |
| 101st Street over Creek | Poor condition + traffic exposure | Poor | 144 | 1929 |
| 118th Street over Little Minnesota River | Poor condition + traffic exposure | Poor | 68 | 1939 |
| 141st Street over Creek | Poor condition + traffic exposure | Poor | 68 | 1969 |
| 468th Avenue over Creek | Poor condition + traffic exposure | Poor | 50 | 1901 |
| 471st Avenue over Creek | Poor condition + traffic exposure | Poor | 50 | 1934 |
| 141st Street over N. Fork Whetstone Rv | Poor condition + traffic exposure | Poor | 38 | 1935 |
| 466th Avenue over Creek | Poor condition + traffic exposure | Poor | 38 | 1940 |
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.