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 |
|---|---|---|---|---|
| Ymca Camp Takodah Sewage Lagoon Dam Cheshire County | 8 | 1940 | Significant | Satisfactory |
| Woodsville Grafton County | 12 | 1827 | Significant | Satisfactory |
| Woodbury Estate Pond Dam Hillsborough County | 16 | 1935 | Significant | Satisfactory |
| Wiswall Dam Strafford County | 22 | 1911 | Significant | Fair |
| Winding Brook Road Dam Rockingham County | 8 | 1980 | Significant | Poor |
| Wilson Pond Dam Cheshire County | 8 | 1920 | Significant | Poor |
| Whitefield Lagoon Dam Coos County | 32 | 1984 | Significant | Satisfactory |
| Wendall Marsh Dam Sullivan County | 15 | — | Significant | Fair |
| Weeks Crossing Pond Dam Grafton County | 14 | — | Significant | Satisfactory |
| Webster Valve CO Dam Merrimack County | 15 | 1901 | Significant | Poor |
| Webster Merrimack County | 22 | 1917 | Significant | Satisfactory |
| Waterville Valley Lagoons Dam Grafton County | 19 | 1972 | Significant | Satisfactory |
| Village Pond Dam Cheshire County | 15 | 1919 | Significant | Poor |
| Vilas Pool Dam Cheshire County | 31 | 1866 | Significant | Poor |
| Upper City Dam Strafford County | 14 | 1920 | Significant | Fair |
| Upper Bucknell Pond Dam Carroll County | 31 | 2010 | Significant | Not Rated |
| Union Street Hillsborough County | 15 | 1916 | Significant | Satisfactory |
| Union Meadows Dam Carroll County | 10 | 1935 | Significant | Poor |
| Unh Water Treament Residual Lagoons Strafford County | 5 | 2017 | Significant | Satisfactory |
| Tyler Tree Farm Dam Grafton County | 25 | 1969 | Significant | Fair |
| Troy Sewage Lagoons Dam Cheshire County | 16 | 1983 | Significant | Satisfactory |
| Transfer Station Lagoons Dam Merrimack County | — | — | Significant | Unsatisfactory |
| Todd Lake Dam Merrimack County | 17 | 1858 | Significant | Poor |
| Thornwood Commons Pond Dam Strafford County | 16 | 1961 | Significant | Satisfactory |
| Taylor Reservoir Dam Rockingham County | 21 | 1918 | Significant | 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.