Risky reservoirs: South Carolina counties where aging dams pose the greatest threat

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- Total high-hazard dams: 66
- Number potentially dangerous: 7 (10.6%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 5 in poor condition
--- 1 not rated

#32. Greenville County
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- Total high-hazard dams: 28
- Number potentially dangerous: 3 (10.7%)
- Potentially dangerous dams include:
--- 2 in poor condition
--- 1 condition withheld

#31. Anderson County
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- Total high-hazard dams: 47
- Number potentially dangerous: 6 (12.8%)
- Potentially dangerous dams include:
--- 3 in poor condition
--- 3 condition withheld

#30. Oconee County
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- Total high-hazard dams: 14
- Number potentially dangerous: 2 (14.3%)
- Potentially dangerous dams include:
--- 2 in poor condition

#29. Edgefield County
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- Total high-hazard dams: 38
- Number potentially dangerous: 6 (15.8%)
- Potentially dangerous dams include:
--- 5 in poor condition
--- 1 not rated

#28. Pickens County
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- Total high-hazard dams: 48
- Number potentially dangerous: 8 (16.7%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 7 in poor condition

#27. Aiken County
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- Total high-hazard dams: 5
- Number potentially dangerous: 1 (20.0%)
- Potentially dangerous dams include:
--- 1 in poor condition

#26. Saluda County
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- Total high-hazard dams: 20
- Number potentially dangerous: 4 (20.0%)
- Potentially dangerous dams include:
--- 4 in poor condition

#25. Calhoun County
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- Total high-hazard dams: 9
- Number potentially dangerous: 2 (22.2%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 1 not rated

#24. Lancaster County
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- Total high-hazard dams: 26
- Number potentially dangerous: 6 (23.1%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 4 in poor condition
--- 1 not rated

#23. York County
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- Total high-hazard dams: 37
- Number potentially dangerous: 9 (24.3%)
- Potentially dangerous dams include:
--- 9 in poor condition

#22. Spartanburg County
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- Total high-hazard dams: 4
- Number potentially dangerous: 1 (25.0%)
- Potentially dangerous dams include:
--- 1 in poor condition

#21. Florence County
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- Total high-hazard dams: 17
- Number potentially dangerous: 5 (29.4%)
- Potentially dangerous dams include:
--- 4 in poor condition
--- 1 condition withheld

#20. Greenwood County
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- Total high-hazard dams: 10
- Number potentially dangerous: 3 (30.0%)
- Potentially dangerous dams include:
--- 3 in poor condition

#19. Kershaw County
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- Total high-hazard dams: 13
- Number potentially dangerous: 4 (30.8%)
- Potentially dangerous dams include:
--- 2 in poor condition
--- 2 not rated

#18. Chester County
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- Total high-hazard dams: 60
- Number potentially dangerous: 19 (31.7%)
- Potentially dangerous dams include:
--- 5 posing immediate threat
--- 11 in poor condition
--- 3 not rated

#17. Richland County
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- Total high-hazard dams: 3
- Number potentially dangerous: 1 (33.3%)
- Potentially dangerous dams include:
--- 1 in poor condition

#16. Newberry County
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- Total high-hazard dams: 3
- Number potentially dangerous: 1 (33.3%)
- Potentially dangerous dams include:
--- 1 in poor condition

#15. Lee County
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- Total high-hazard dams: 12
- Number potentially dangerous: 4 (33.3%)
- Potentially dangerous dams include:
--- 3 in poor condition
--- 1 not rated

#14. Darlington County
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- Total high-hazard dams: 38
- Number potentially dangerous: 13 (34.2%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 11 in poor condition
--- 1 not rated

#13. Orangeburg County
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- Total high-hazard dams: 46
- Number potentially dangerous: 18 (39.1%)
- Potentially dangerous dams include:
--- 4 posing immediate threat
--- 11 in poor condition
--- 3 not rated

#12. Lexington County
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- Total high-hazard dams: 5
- Number potentially dangerous: 2 (40.0%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 1 condition withheld

#11. Abbeville County
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- Total high-hazard dams: 15
- Number potentially dangerous: 6 (40.0%)
- Potentially dangerous dams include:
--- 4 in poor condition
--- 2 condition withheld

#10. Barnwell County
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- Total high-hazard dams: 9
- Number potentially dangerous: 4 (44.4%)
- Potentially dangerous dams include:
--- 4 in poor condition

#9. Sumter County
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- Total high-hazard dams: 6
- Number potentially dangerous: 3 (50.0%)
- Potentially dangerous dams include:
--- 2 in poor condition
--- 1 not rated

#8. Allendale County
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- Total high-hazard dams: 16
- Number potentially dangerous: 9 (56.3%)
- Potentially dangerous dams include:
--- 6 in poor condition
--- 3 condition withheld

#7. Berkeley County
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- Total high-hazard dams: 11
- Number potentially dangerous: 7 (63.6%)
- Potentially dangerous dams include:
--- 7 in poor condition

#6. Chesterfield County
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- Total high-hazard dams: 7
- Number potentially dangerous: 5 (71.4%)
- Potentially dangerous dams include:
--- 3 in poor condition
--- 2 not rated

#5. Horry County
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- Total high-hazard dams: 1
- Number potentially dangerous: 1 (100.0%)
- Potentially dangerous dams include:
--- 1 posing immediate threat

#4. Colleton County
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- Total high-hazard dams: 1
- Number potentially dangerous: 1 (100.0%)
- Potentially dangerous dams include:
--- 1 in poor condition

#3. Marion County
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- Total high-hazard dams: 1
- Number potentially dangerous: 1 (100.0%)
- Potentially dangerous dams include:
--- 1 in poor condition

#2. Dillon County
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- Total high-hazard dams: 11
- Number potentially dangerous: 11 (100.0%)
- Potentially dangerous dams include:
--- 10 in poor condition
--- 1 not rated

This story features data reporting by Paxtyn Merten, writing by Dom DiFurio, and is part of a series utilizing data automation across 50 states.

#1. Marlboro County
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