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

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- Total high-hazard dams: 21
- Number potentially dangerous: 1 (4.8%)
- Potentially dangerous dams include:
--- 1 in poor condition

#17. Washington County
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- Total high-hazard dams: 28
- Number potentially dangerous: 3 (10.7%)
- Potentially dangerous dams include:
--- 3 in poor condition

#16. Salt Lake County
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- Total high-hazard dams: 13
- Number potentially dangerous: 2 (15.4%)
- Potentially dangerous dams include:
--- 2 condition withheld

#15. Uintah County
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- Total high-hazard dams: 5
- Number potentially dangerous: 1 (20.0%)
- Potentially dangerous dams include:
--- 1 condition withheld

#14. Box Elder County
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- Total high-hazard dams: 7
- Number potentially dangerous: 2 (28.6%)
- Potentially dangerous dams include:
--- 2 in poor condition

#13. Sanpete County
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- Total high-hazard dams: 3
- Number potentially dangerous: 1 (33.3%)
- Potentially dangerous dams include:
--- 1 condition withheld

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

#11. Kane County
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- Total high-hazard dams: 12
- Number potentially dangerous: 4 (33.3%)
- Potentially dangerous dams include:
--- 4 condition withheld

#10. Duchesne County
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- Total high-hazard dams: 40
- Number potentially dangerous: 14 (35.0%)
- Potentially dangerous dams include:
--- 14 condition withheld

#9. Davis County
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- Total high-hazard dams: 14
- Number potentially dangerous: 5 (35.7%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 4 condition withheld

#8. Wasatch County
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- Total high-hazard dams: 5
- Number potentially dangerous: 2 (40.0%)
- Potentially dangerous dams include:
--- 2 condition withheld

#7. Morgan County
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- Total high-hazard dams: 2
- Number potentially dangerous: 1 (50.0%)
- Potentially dangerous dams include:
--- 1 condition withheld

#6. Carbon County
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- Total high-hazard dams: 2
- Number potentially dangerous: 1 (50.0%)
- Potentially dangerous dams include:
--- 1 in poor condition

#5. Rich County
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- Total high-hazard dams: 2
- Number potentially dangerous: 1 (50.0%)
- Potentially dangerous dams include:
--- 1 condition withheld

#4. Daggett County
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- Total high-hazard dams: 7
- Number potentially dangerous: 4 (57.1%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 3 condition withheld

#3. Cache County
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- Total high-hazard dams: 16
- Number potentially dangerous: 10 (62.5%)
- Potentially dangerous dams include:
--- 10 condition withheld

#2. Weber County
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- Total high-hazard dams: 13
- Number potentially dangerous: 9 (69.2%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 8 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. Summit County
venuswix // Shutterstock