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 101–125 of 185
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Jackson Mills Hillsborough County | 33 | 1920 | Significant | Satisfactory |
| Icy Gulch Reservoir Dam Coos County | 18 | 1940 | Significant | Satisfactory |
| Hubbard Pond Dam & Dike Cheshire County | 8 | 1836 | Significant | Fair |
| Hopkinton Sewage Lagoon Dam Merrimack County | 18 | 1983 | Significant | Satisfactory |
| Hoague - Sprague Merrimack County | 14 | 1906 | Significant | Satisfactory |
| Hillsborough Sewage Lagoon Dam Hillsborough County | 12 | 1984 | Significant | Fair |
| Hillsborough Mill Hillsborough County | 22 | 1925 | Significant | Fair |
| Highland Lake Dam Merrimack County | 10 | 1935 | Significant | Fair |
| Hawkins Pond Dam Belknap County | 12 | 1873 | Significant | Fair |
| Hatfields Strafford County | 20 | 1937 | Significant | Satisfactory |
| Harris Brook Reservoir Dam Grafton County | 22 | 1903 | Significant | Poor |
| Harantis Lake Dam Rockingham County | 14 | 1930 | Significant | Poor |
| Hadley Falls Hillsborough County | 20 | 1922 | Significant | Satisfactory |
| Gulch Mountain Pond Dam Rockingham County | 15 | 1965 | Significant | Poor |
| Groveton Paper Mill Lagoons Dam Coos County | 25 | 2010 | Significant | Fair |
| Groveton Municipal Lagoons Dam Coos County | 20 | 2012 | Significant | Satisfactory |
| Gordon Hill Water Supply Dam Belknap County | 15 | 1934 | Significant | Satisfactory |
| Gonic Dam Strafford County | 16 | 1935 | Significant | Fair |
| Godfrey Dam Coos County | 18 | 1920 | Significant | Satisfactory |
| Glen Road Grafton County | 17 | 1988 | Significant | Satisfactory |
| Frog Pond Dam Hillsborough County | 15 | 1916 | Significant | Not Rated |
| Franklin Falls Hydro Dam 2 Merrimack County | 20 | 1888 | Significant | Not Rated |
| Farrar Marsh Dam Hillsborough County | 11 | 1978 | Significant | Fair |
| Faraway Pond Dam Coos County | 20 | 1975 | Significant | Satisfactory |
| Exeter Sewage Lagoon Dam Rockingham County | 12 | 1989 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.