Bon Homme County Bridge Report Card
Bon Homme County scores 44 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Bon Homme County, South Dakota
Bon Homme County has 126 bridges in the National Bridge Inventory, with 34 rated poor and 3 rated scour-critical. Its poor-condition share of 27.0% is above the 16.1% statewide average. Poor-condition bridges carry about 3,009 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Bon Homme County a Bridge Condition Exposure Score of 44/100 (F). The county has 126 bridges in the National Bridge Inventory, including 34 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 3,009 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 | 27.0% | 40.0 |
| Poor-condition traffic exposure | 25 | 7.4% of measured traffic | 5.5 |
| Scour-critical bridge share | 20 | 2.4% | 4.8 |
| Average age vs national baseline | 10 | 63 years vs 48 nationally | 5.9 |
| Traffic-data completeness | 5 | 40,802 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 | 27.0% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 2.4% |
| Average Bridge Age | 63 years |
| Poor-Condition Traffic Exposure | 3,009 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Bon Homme County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Sd037 over Missouri River | Poor condition + traffic exposure | Poor | 830 | 1996 |
| 42520 293rd Street over Creek | Poor condition + traffic exposure | Poor | 138 | 1939 |
| 30480 428th Avenue over Beaver Creek | Poor condition + traffic exposure | Poor | 130 | 1940 |
| 29210 412th Avenue over Emanuel Creek | Poor condition + traffic exposure | Poor | 127 | 1975 |
| 40510 308th Street over Trib. To Choteau Creek | Poor condition + traffic exposure | Poor | 115 | 1935 |
| 310th Street over Trib To Snatch Ck | Poor condition + traffic exposure | Poor | 88 | 1940 |
| 29600 426th Avenue over Prairie Creek | Poor condition + traffic exposure | Poor | 60 | 1905 |
| 42090 303rd Street over Snatch Creek | Poor condition + traffic exposure | Poor | 60 | 1910 |
| 40430 308th Street over Choteau Creek | Poor condition + traffic exposure | Poor | 60 | 1912 |
| Stone House Road over Dry Choteau Creek | Poor condition + traffic exposure | Poor | 60 | 1924 |
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.