County 102 County Bridge Report Card
County 102 County scores 83 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
County 102 County, South Dakota
County 102 County has 35 bridges in the National Bridge Inventory, with 2 rated poor and 1 rated scour-critical. Its poor-condition share of 5.7% is at or below the 16.1% statewide average. Poor-condition bridges carry about 60 daily vehicle crossings.
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BridgeLookup.com gives County 102 County a Bridge Condition Exposure Score of 83/100 (B). The county has 35 bridges in the National Bridge Inventory, including 2 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 60 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 | 5.7% | 11.4 |
| Poor-condition traffic exposure | 25 | 0.1% of measured traffic | 0.1 |
| Scour-critical bridge share | 20 | 2.9% | 5.7 |
| Average age vs national baseline | 10 | 33 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 51,010 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 | 5.7% |
| State Poor-Condition Share | 16.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 2.9% |
| Average Bridge Age | 33 years |
| Poor-Condition Traffic Exposure | 60 vehicles/day |
Bridges to Watch
Top Bridges to Watch in County 102 County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Moccasin Park RD over White Clay Creek | Poor condition + traffic exposure | Poor | 50 | 1975 |
| Smithwick Road over White River | Poor condition + traffic exposure | Poor | 10 | 1935 |
| IRR Us018 over Slim Butte Ck | Scour-critical foundation rating | Fair | 1,294 | 1953 |
| IRR BIA RTE 36 over White Clay Creek | High traffic | Good | 7,551 | 2001 |
| IRR Us018 over Wolf Ck | High traffic | Fair | 5,154 | 2006 |
| IRR Us018 over Ck | High traffic | Good | 3,597 | 2016 |
| IRR Us018 over Ck | High traffic | Good | 3,274 | 2011 |
| IRR Us018 over Cheyenne Ck | High traffic | Good | 3,274 | 2020 |
| IRR BIA RTE 27 over White River | High traffic | Fair | 2,368 | 1985 |
| IRR Us018 over White Clay Ck | High traffic | Fair | 2,131 | 2011 |
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.