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

- Total high-hazard dams: 17
- Number potentially dangerous: 1 (5.9%)
- Potentially dangerous dams include:
--- 1 not rated

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

- Total high-hazard dams: 25
- Number potentially dangerous: 2 (8.0%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 1 not rated

- Total high-hazard dams: 11
- Number potentially dangerous: 1 (9.1%)
- Potentially dangerous dams include:
--- 1 in poor condition
- Total high-hazard dams: 11
- Number potentially dangerous: 1 (9.1%)
- Potentially dangerous dams include:
--- 1 condition withheld

- Total high-hazard dams: 40
- Number potentially dangerous: 4 (10.0%)
- Potentially dangerous dams include:
--- 3 in poor condition
--- 1 condition withheld
- Total high-hazard dams: 15
- Number potentially dangerous: 2 (13.3%)
- Potentially dangerous dams include:
--- 2 in poor condition

- Total high-hazard dams: 7
- Number potentially dangerous: 1 (14.3%)
- Potentially dangerous dams include:
--- 1 in poor condition
- Total high-hazard dams: 14
- Number potentially dangerous: 2 (14.3%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 1 condition withheld

- Total high-hazard dams: 21
- Number potentially dangerous: 3 (14.3%)
- Potentially dangerous dams include:
--- 2 in poor condition
--- 1 condition withheld

- Total high-hazard dams: 6
- Number potentially dangerous: 1 (16.7%)
- Potentially dangerous dams include:
--- 1 not rated
- Total high-hazard dams: 46
- Number potentially dangerous: 8 (17.4%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 7 in poor condition
- Total high-hazard dams: 11
- Number potentially dangerous: 2 (18.2%)
- Potentially dangerous dams include:
--- 2 in poor condition

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

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

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

- Total high-hazard dams: 25
- Number potentially dangerous: 5 (20.0%)
- Potentially dangerous dams include:
--- 4 in poor condition
--- 1 condition withheld
- Total high-hazard dams: 14
- Number potentially dangerous: 3 (21.4%)
- Potentially dangerous dams include:
--- 2 in poor condition
--- 1 condition withheld

- Total high-hazard dams: 9
- Number potentially dangerous: 2 (22.2%)
- Potentially dangerous dams include:
--- 2 in poor condition

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

- Total high-hazard dams: 43
- Number potentially dangerous: 11 (25.6%)
- Potentially dangerous dams include:
--- 9 in poor condition
--- 2 condition withheld
- Total high-hazard dams: 31
- Number potentially dangerous: 8 (25.8%)
- Potentially dangerous dams include:
--- 5 in poor condition
--- 3 condition withheld

- Total high-hazard dams: 18
- Number potentially dangerous: 5 (27.8%)
- Potentially dangerous dams include:
--- 4 in poor condition
--- 1 not rated

- Total high-hazard dams: 10
- Number potentially dangerous: 3 (30.0%)
- Potentially dangerous dams include:
--- 2 in poor condition
--- 1 condition withheld

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

- Total high-hazard dams: 23
- Number potentially dangerous: 7 (30.4%)
- Potentially dangerous dams include:
--- 2 posing immediate threat
--- 2 in poor condition
--- 3 condition withheld

- Total high-hazard dams: 49
- Number potentially dangerous: 15 (30.6%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 12 in poor condition
--- 2 condition withheld

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

- Total high-hazard dams: 3
- Number potentially dangerous: 1 (33.3%)
- Potentially dangerous dams include:
--- 1 in poor condition
- Total high-hazard dams: 33
- Number potentially dangerous: 11 (33.3%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 8 in poor condition
--- 2 condition withheld
- Total high-hazard dams: 36
- Number potentially dangerous: 12 (33.3%)
- Potentially dangerous dams include:
--- 10 in poor condition
--- 2 condition withheld

- Total high-hazard dams: 43
- Number potentially dangerous: 15 (34.9%)
- Potentially dangerous dams include:
--- 2 posing immediate threat
--- 13 in poor condition
- Total high-hazard dams: 14
- Number potentially dangerous: 5 (35.7%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 3 in poor condition
--- 1 condition withheld

- Total high-hazard dams: 8
- Number potentially dangerous: 3 (37.5%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 1 in poor condition
--- 1 condition withheld

- Total high-hazard dams: 13
- Number potentially dangerous: 5 (38.5%)
- Potentially dangerous dams include:
--- 5 in poor condition

- Total high-hazard dams: 5
- Number potentially dangerous: 2 (40.0%)
- Potentially dangerous dams include:
--- 2 in poor condition

- Total high-hazard dams: 5
- Number potentially dangerous: 2 (40.0%)
- Potentially dangerous dams include:
--- 2 in poor condition

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

- Total high-hazard dams: 2
- Number potentially dangerous: 1 (50.0%)
- Potentially dangerous dams include:
--- 1 condition withheld

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

- Total high-hazard dams: 4
- Number potentially dangerous: 2 (50.0%)
- Potentially dangerous dams include:
--- 2 condition withheld

- Total high-hazard dams: 6
- Number potentially dangerous: 3 (50.0%)
- Potentially dangerous dams include:
--- 3 in poor condition
- Total high-hazard dams: 15
- Number potentially dangerous: 8 (53.3%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 7 condition withheld

- Total high-hazard dams: 11
- Number potentially dangerous: 6 (54.5%)
- Potentially dangerous dams include:
--- 4 in poor condition
--- 2 condition withheld
- Total high-hazard dams: 7
- Number potentially dangerous: 4 (57.1%)
- Potentially dangerous dams include:
--- 3 in poor condition
--- 1 condition withheld

- Total high-hazard dams: 7
- Number potentially dangerous: 4 (57.1%)
- Potentially dangerous dams include:
--- 4 in poor condition

- Total high-hazard dams: 3
- Number potentially dangerous: 2 (66.7%)
- Potentially dangerous dams include:
--- 1 in poor condition
--- 1 condition withheld

- Total high-hazard dams: 1
- Number potentially dangerous: 1 (100.0%)
- Potentially dangerous dams include:
--- 1 condition withheld
- Total high-hazard dams: 4
- Number potentially dangerous: 4 (100.0%)
- Potentially dangerous dams include:
--- 1 posing immediate threat
--- 2 in poor condition
--- 1 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.
