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 126–147 of 147
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Cheshire Mills Lower Dam Cheshire County | 18 | 1848 | High | Poor |
| Century Village Dam Rockingham County | 8 | 1988 | Significant | Poor |
| Cass Pond Dam Merrimack County | 10 | — | Low | Poor |
| Camp Foss Sewage Lagoon Dam Strafford County | 10 | 1979 | Significant | Poor |
| Bow Lake Dam Strafford County | 24 | 1832 | High | Poor |
| Bowers Dam Hillsborough County | 25 | 1884 | High | Poor |
| Blaisdell Lake Dam Merrimack County | 9 | 1916 | Low | Poor |
| Black Reservoir Dam Cheshire County | 10 | 1850 | Significant | Poor |
| Big Dodge Pond Dam Rockingham County | 12 | 1917 | Significant | Poor |
| Belleau Lake Dam Carroll County | 16 | 1962 | Significant | Poor |
| Beech River Mill Dam Carroll County | 14 | 1851 | High | Poor |
| Barnstead Parade Dam Belknap County | 16 | 1830 | High | Poor |
| Bancroft Reservoir Dam Cheshire County | 15 | 1935 | Low | Poor |
| Ballard Pond Upper Dam Rockingham County | 7 | 1935 | Low | Poor |
| Baker River Site 6a Dam Grafton County | 68 | 1975 | High | Poor |
| Baker River Site 5 Dam Grafton County | 53 | 1967 | High | Poor |
| Baker River Site 11 Dam Grafton County | 24 | 1971 | High | Poor |
| Baker Brook Pond Dam Grafton County | 11 | 1928 | Significant | Poor |
| Back Lake Dam Coos County | 7 | 1930 | Low | Poor |
| Ashuelot Pond Dam Sullivan County | 13 | 1872 | High | Poor |
| Alton Power Dam Belknap County | 16 | 1923 | High | Poor |
| Airport Marsh Dam Coos County | 11 | 1956 | Low | Poor |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.