New Hampshire Dams
664 dams tracked by the National Inventory of Dams
Total Dams
664
High Hazard
162
24.4%
Poor / Unsatisfactory
152
Average Age
100 yrs
Hazard Classification
High162 (24.4%)
Significant185 (27.9%)
Low300 (45.2%)
Condition Assessment
Satisfactory267 (40.2%)
Fair169 (25.5%)
Poor / Unsatisfactory152 (22.9%)
Not Rated76 (11.4%)
Federal
22
State
170
Local
195
Private
261
Tallest Dams
- Comerford 170 ft
- Moore 149 ft
- Otter Brook Dam119 ft
- Franklin Falls Dam116 ft
- Everett Dam115 ft
High Hazard Dams
- Comerford High
- Moore High
- Otter Brook DamHigh
- Franklin Falls DamHigh
- Everett DamHigh
Poor Condition Dams
All Dams in New Hampshire
Showing 201–225 of 664
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pleasant Lake Dam Rockingham County | 7 | 1921 | Low | Satisfactory |
| Pittsfield Sewage Lagoon Dam Merrimack County | 18 | 1979 | Significant | Satisfactory |
| Pittsfield Mill Dam Merrimack County | 21 | 1920 | High | Poor |
| Pisgah Reservoir Dam Cheshire County | 33 | 1870 | High | Poor |
| Piscassic Ice Pond Dam Rockingham County | 12 | 1939 | Low | Fair |
| Pioneer Lake Dam Cheshire County | 17 | 1971 | Low | Not Rated |
| Pingree Sawmill Dam Rockingham County | 12 | 1812 | Undetermined | Not Rated |
| Pine Rock Farm Pond Dam Strafford County | 12 | 1966 | Low | Fair |
| Pine River Pond Dam Carroll County | 14 | — | Significant | Fair |
| Pine Island Pond Dam Hillsborough County | 19 | 1896 | Low | Fair |
| Pillsbury Lake Dam Merrimack County | 13 | 1964 | Low | Satisfactory |
| Pierce Pond Dam Hillsborough County | 8 | 1700 | High | Poor |
| Pierce Hillsborough County | 12 | 1921 | Low | Satisfactory |
| Pickpocket Dam Rockingham County | 15 | 1920 | High | Poor |
| Pickering Ponds Dam Strafford County | 24 | 1980 | Low | Not Rated |
| Phillips Pond Dam Coos County | 15 | 1926 | Low | Not Rated |
| Pheasant Ridge Cc Pond Dam Belknap County | 25 | 1976 | Significant | Fair |
| Peters Farm Pond Dam Hillsborough County | 9 | 1856 | Significant | Unsatisfactory |
| Peterborough Treatment Lagoon Dam Hillsborough County | 9 | 1972 | Significant | Fair |
| Perry Pond Dam Coos County | 7 | 1947 | Undetermined | Poor |
| Perkins Pond Marsh Dam Hillsborough County | 15 | 1924 | Low | Satisfactory |
| Perkins Pond Dam Cheshire County | 7 | 1935 | Low | Fair |
| Pequawket Pond Dam Carroll County | 15 | — | Low | Fair |
| Penacook Upper Falls Merrimack County | 23 | 1987 | Low | Satisfactory |
| Penacook Lower Falls Diversion Merrimack County | 15 | 1982 | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.