Risky reservoirs: Colorado counties where aging dams pose the greatest threat

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- Total high-hazard dams: 16
- Number potentially dangerous: 1 (6.3%)
- Potentially dangerous dams include:
--- 1 not rated

#41. Weld County
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- Total high-hazard dams: 12
- Number potentially dangerous: 1 (8.3%)
- Potentially dangerous dams include:
--- 1 not rated

#40. Clear Creek County
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- Total high-hazard dams: 23
- Number potentially dangerous: 2 (8.7%)
- Potentially dangerous dams include:
--- 2 condition withheld

#39. Delta County
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- Total high-hazard dams: 11
- Number potentially dangerous: 1 (9.1%)
- Potentially dangerous dams include:
--- 1 not rated

#38. Eagle County
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- Total high-hazard dams: 27
- Number potentially dangerous: 3 (11.1%)
- Potentially dangerous dams include:
--- 2 posing immediate threat
--- 1 condition withheld

#37. Mesa County
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- Total high-hazard dams: 8
- Number potentially dangerous: 1 (12.5%)
- Potentially dangerous dams include:
--- 1 posing immediate threat

#36. Park County
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- Total high-hazard dams: 6
- Number potentially dangerous: 1 (16.7%)
- Potentially dangerous dams include:
--- 1 posing immediate threat

#35. Huerfano County
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- Total high-hazard dams: 28
- Number potentially dangerous: 6 (21.4%)
- Potentially dangerous dams include:
--- 3 posing immediate threat
--- 3 condition withheld

#34. El Paso County
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- Total high-hazard dams: 9
- Number potentially dangerous: 2 (22.2%)
- Potentially dangerous dams include:
--- 2 condition withheld

#33. Montrose County
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- Total high-hazard dams: 4
- Number potentially dangerous: 1 (25.0%)
- Potentially dangerous dams include:
--- 1 not rated

#32. Chaffee County
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- Total high-hazard dams: 4
- Number potentially dangerous: 1 (25.0%)
- Potentially dangerous dams include:
--- 1 condition withheld

#31. Archuleta County
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- Total high-hazard dams: 4
- Number potentially dangerous: 1 (25.0%)
- Potentially dangerous dams include:
--- 1 posing immediate threat

#30. Hinsdale County
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- Total high-hazard dams: 8
- Number potentially dangerous: 2 (25.0%)
- Potentially dangerous dams include:
--- 2 posing immediate threat

#29. Denver County
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- Total high-hazard dams: 12
- Number potentially dangerous: 3 (25.0%)
- Potentially dangerous dams include:
--- 3 condition withheld

#28. La Plata County
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- Total high-hazard dams: 64
- Number potentially dangerous: 16 (25.0%)
- Potentially dangerous dams include:
--- 1 not rated
--- 15 condition withheld

#27. Larimer County
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- Total high-hazard dams: 30
- Number potentially dangerous: 8 (26.7%)
- Potentially dangerous dams include:
--- 5 posing immediate threat
--- 1 not rated
--- 2 condition withheld

#26. Jefferson County
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- Total high-hazard dams: 7
- Number potentially dangerous: 2 (28.6%)
- Potentially dangerous dams include:
--- 1 not rated
--- 1 condition withheld

#25. Pitkin County
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- Total high-hazard dams: 7
- Number potentially dangerous: 2 (28.6%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 1 condition withheld

#24. Las Animas County
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- Total high-hazard dams: 3
- Number potentially dangerous: 1 (33.3%)
- Potentially dangerous dams include:
--- 1 not rated

#23. Rio Grande County
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- Total high-hazard dams: 3
- Number potentially dangerous: 1 (33.3%)
- Potentially dangerous dams include:
--- 1 posing immediate threat

#22. Rio Blanco County
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- Total high-hazard dams: 6
- Number potentially dangerous: 2 (33.3%)
- Potentially dangerous dams include:
--- 2 condition withheld

#21. Douglas County
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- Total high-hazard dams: 8
- Number potentially dangerous: 3 (37.5%)
- Potentially dangerous dams include:
--- 2 not rated
--- 1 condition withheld

#20. Arapahoe County
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- Total high-hazard dams: 8
- Number potentially dangerous: 3 (37.5%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 1 not rated
--- 1 condition withheld

#19. Pueblo County
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- Total high-hazard dams: 10
- Number potentially dangerous: 4 (40.0%)
- Potentially dangerous dams include:
--- 2 posing immediate threat
--- 1 not rated
--- 1 condition withheld

#18. Garfield County
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- Total high-hazard dams: 2
- Number potentially dangerous: 1 (50.0%)
- Potentially dangerous dams include:
--- 1 posing immediate threat

#17. Moffat County
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- Total high-hazard dams: 2
- Number potentially dangerous: 1 (50.0%)
- Potentially dangerous dams include:
--- 1 posing immediate threat

#16. Costilla County
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- Total high-hazard dams: 4
- Number potentially dangerous: 2 (50.0%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 1 in poor condition

#15. San Miguel County
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- Total high-hazard dams: 4
- Number potentially dangerous: 2 (50.0%)
- Potentially dangerous dams include:
--- 2 condition withheld

#14. Conejos County
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- Total high-hazard dams: 9
- Number potentially dangerous: 5 (55.6%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 4 condition withheld

#13. Summit County
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- Total high-hazard dams: 10
- Number potentially dangerous: 6 (60.0%)
- Potentially dangerous dams include:
--- 3 posing immediate threat
--- 3 condition withheld

#12. Montezuma County
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- Total high-hazard dams: 8
- Number potentially dangerous: 5 (62.5%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 4 condition withheld

#11. Gunnison County
Bob Pool // Shutterstock

- Total high-hazard dams: 3
- Number potentially dangerous: 2 (66.7%)
- Potentially dangerous dams include:
--- 2 posing immediate threat

#10. Logan County
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- Total high-hazard dams: 3
- Number potentially dangerous: 2 (66.7%)
- Potentially dangerous dams include:
--- 2 condition withheld

#9. Bent County
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- Total high-hazard dams: 14
- Number potentially dangerous: 10 (71.4%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 1 not rated
--- 8 condition withheld

#8. Grand County
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- Total high-hazard dams: 1
- Number potentially dangerous: 1 (100.0%)
- Potentially dangerous dams include:
--- 1 condition withheld

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

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

#5. Saguache 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. Washington County
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- Total high-hazard dams: 2
- Number potentially dangerous: 2 (100.0%)
- Potentially dangerous dams include:
--- 1 not rated
--- 1 condition withheld

#3. Ouray County
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- Total high-hazard dams: 3
- Number potentially dangerous: 3 (100.0%)
- Potentially dangerous dams include:
--- 3 posing immediate threat

#2. Sedgwick County
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- Total high-hazard dams: 6
- Number potentially dangerous: 6 (100.0%)
- Potentially dangerous dams include:
--- 6 condition withheld

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. Lake County
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