Dams in New Hampshire
664
Total Dams
161
High Hazard
24.25%
% High Hazard
99.8 yrs
Average Age
Counties
| County | Dams | High Hazard | % High | Avg Age |
|---|---|---|---|---|
| Hillsborough | 105 | 37 | 35.24% | 96.5 yrs |
| Grafton | 82 | 25 | 30.49% | 93.2 yrs |
| Cheshire | 89 | 22 | 24.72% | 117.6 yrs |
| Merrimack | 89 | 18 | 20.22% | 107.6 yrs |
| Strafford | 51 | 13 | 25.49% | 99.1 yrs |
| Rockingham | 74 | 11 | 14.86% | 95.4 yrs |
| Carroll | 35 | 10 | 28.57% | 112.6 yrs |
| Coos | 60 | 10 | 16.67% | 84.5 yrs |
| Belknap | 36 | 8 | 22.22% | 99.5 yrs |
| Sullivan | 42 | 7 | 16.67% | 85.9 yrs |
Purpose Breakdown
Tallest Dams in New Hampshire
| Dam Name | Height | County | Hazard |
|---|---|---|---|
| Comerford | 170 ft | Grafton | High Hazard |
| Moore | 149 ft | Grafton | High Hazard |
| Otter Brook Dam | 119 ft | Cheshire | High Hazard |
| Franklin Falls Dam | 116 ft | Merrimack | High Hazard |
| Everett Dam | 110 ft | Hillsborough | High Hazard |
| Murphy Dam | 106 ft | Coos | High Hazard |
| Whitewater Brook Dam | 95 ft | Sullivan | High Hazard |
| Surry Mountain Dam | 83 ft | Cheshire | High Hazard |
| Ayers Island | 80 ft | Grafton | Significant Hazard |
| Souhegan River Site 26 Dam | 79 ft | Hillsborough | High Hazard |