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 401–425 of 664
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hermit Lake Dam Belknap County | 20 | 1927 | Low | Fair |
| Hermit Hill Farm Pond Dam Grafton County | 13 | 1975 | Low | Satisfactory |
| Hayes Marsh Dam Merrimack County | 10 | 1951 | Low | Fair |
| Hawkins Pond Dam Belknap County | 12 | 1873 | Significant | Fair |
| Hatfields Strafford County | 20 | 1937 | Significant | Satisfactory |
| Harrisville Pond Dam Cheshire County | 16 | 1886 | High | Fair |
| Harris Pond Dam Hillsborough County | 35 | 1861 | High | Satisfactory |
| Harris Brook Reservoir Dam Grafton County | 22 | 1903 | Significant | Poor |
| Hargate Dam Merrimack County | 14 | 1835 | Low | Satisfactory |
| Harantis Lake Dam Rockingham County | 14 | 1930 | Significant | Poor |
| Hanover Center Reservoir Dam Grafton County | 30 | 1962 | High | Satisfactory |
| Hall Pond Dike Sullivan County | 7 | 1955 | Low | Satisfactory |
| Hall Pond Dam Sullivan County | 9 | 1935 | Low | Satisfactory |
| Hall Mountain Marsh Dam Merrimack County | 13 | 1945 | Low | Fair |
| Hadley Falls Hillsborough County | 20 | 1922 | Significant | Satisfactory |
| Gunnison Lake Site D2 Dam Sullivan County | 62 | 1983 | High | Fair |
| Gumpas Pond Dam Hillsborough County | 10 | 1900 | High | Poor |
| 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 |
| Grist Mill Pond Dam Grafton County | 16 | 1924 | High | Poor |
| Gregg Lake Dam Hillsborough County | 12 | 1908 | High | Poor |
| Gregg Falls Hillsborough County | 66 | 1917 | High | Satisfactory |
| Great East Lake Dam Carroll County | 15 | 1825 | High | Poor |
| Grassy Pond Dam Merrimack County | 9 | 1836 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.