Williamsburg County Bridge Report Card
Williamsburg County scores 79 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Williamsburg County, South Carolina
Williamsburg County has 194 bridges in the National Bridge Inventory, with 12 rated poor and 6 rated scour-critical. Its poor-condition share of 6.2% is at or below the 6.3% statewide average. Poor-condition bridges carry about 5,825 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Williamsburg County a Bridge Condition Exposure Score of 79/100 (C). The county has 194 bridges in the National Bridge Inventory, including 12 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 5,825 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 | 6.2% | 12.4 |
| Poor-condition traffic exposure | 25 | 2.5% of measured traffic | 1.9 |
| Scour-critical bridge share | 20 | 3.1% | 6.2 |
| Average age vs national baseline | 10 | 48 years vs 48 nationally | 0.3 |
| Traffic-data completeness | 5 | 232,025 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 | 6.2% |
| State Poor-Condition Share | 6.3% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.1% |
| Average Bridge Age | 48 years |
| Poor-Condition Traffic Exposure | 5,825 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Williamsburg County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Sc 527 over Boggy Swamp | Poor condition + traffic exposure | Poor | 1,450 | 1943 |
| S-45-33 over Mill Branch | Poor condition + traffic exposure | Poor | 1,400 | 1972 |
| Sc 512 over Paisley Swamp (no. 2) | Poor condition + traffic exposure | Poor | 750 | 1978 |
| S-45-38 over Cedar Swamp | Poor condition + traffic exposure | Poor | 350 | 1976 |
| S-45-85 over Boggy Swamp | Poor condition + traffic exposure | Poor | 300 | 1965 |
| S-45-454 over Br Of Clapp Swamp | Poor condition + traffic exposure | Poor | 300 | 1968 |
| S-45-259 over Clapp Swamp | Poor condition + traffic exposure | Poor | 275 | 1960 |
| S-45-40 over Br Of Muddy Ck (co Line) | Poor condition + traffic exposure | Poor | 275 | 1963 |
| L-964 Alvamarie LN over Branch To Kingstree Cana | Poor condition + traffic exposure | Poor | 200 | 1961 |
| C-45-400 over Smiths Swamp | Poor condition + traffic exposure | Poor | 200 | 1965 |
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.