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 1–25 of 185
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Antrim Sewage Lagoons Dam Hillsborough County | 13 | 1978 | Significant | Satisfactory |
| Apthorp Grafton County | 24 | 1936 | Significant | Satisfactory |
| Arlington Mill Res Evergreen Dike Rockingham County | 31 | 1922 | Significant | Fair |
| Armington Lake Dam Grafton County | 9 | 1900 | Significant | Satisfactory |
| Ashland Sewage Lagoon Dam Grafton County | 15 | 1968 | Significant | Fair |
| Atkinson Cc Lagoon Dam Rockingham County | 14 | 2001 | Significant | Satisfactory |
| Ayers Island Grafton County | 80 | 1924 | Significant | Satisfactory |
| Ayers Pond Dam Strafford County | 18 | 1810 | Significant | Fair |
| Baker Brook Pond Dam Grafton County | 11 | 1928 | Significant | Poor |
| Baker River Site 6 Dam Grafton County | 14 | 1969 | Significant | Satisfactory |
| Ballard Pond Mill Dam Rockingham County | 21 | 1941 | Significant | Satisfactory |
| Balsams Mohawk River Dam Coos County | 55 | — | Significant | Not Rated |
| Balsams Wastewater Lagoons Dam Coos County | 28 | 1965 | Significant | Fair |
| Baxter Lake Main Dam Strafford County | 19 | 1923 | Significant | Fair |
| Beards Creek Dam Strafford County | 16 | 1953 | Significant | Satisfactory |
| Belleau Lake Dam Carroll County | 16 | 1962 | Significant | Poor |
| Bethlehem Sewage Lagoon Dam Grafton County | 13 | 1985 | Significant | Satisfactory |
| Big Brook Bog Dam Coos County | 11 | 1946 | Significant | Fair |
| Big Dan Hole Pond Dam Carroll County | 13 | 1910 | Significant | Fair |
| Big Dodge Pond Dam Rockingham County | 12 | 1917 | Significant | Poor |
| Big Island Pond Walter Stickney Dam Rockingham County | 10 | 1905 | Significant | Satisfactory |
| Black Reservoir Dam Cheshire County | 10 | 1850 | Significant | Poor |
| Bodwell Septage Facility Dam Rockingham County | 9 | 2010 | Significant | Satisfactory |
| Bog Pond Dam Merrimack County | 17 | 1870 | Significant | Satisfactory |
| Boston Lot Lake Dam Grafton County | 25 | 1936 | Significant | Satisfactory |
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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.