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 276–300 of 664
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Morrill Mill Pond Dam Merrimack County | 11 | 1800 | Low | Poor |
| Morgan Pond Dam Sullivan County | 12 | 1939 | Significant | Fair |
| Morey Pond Dam Merrimack County | 12 | — | Low | Fair |
| Moose Falls Dam Coos County | 10 | 1950 | Significant | Poor |
| Moose Brook Dam Hillsborough County | 9 | 1977 | Low | Fair |
| Moore Grafton County | 149 | 1957 | High | Satisfactory |
| Montcalm Golf Club Dam Grafton County | 27 | 1984 | Low | Fair |
| Monadnock Paper Indust Lag Dam Hillsborough County | 14 | 1973 | Significant | Satisfactory |
| Monadnock Hillsborough County | 22 | 1923 | Low | Satisfactory |
| Mirror Lake Dam Grafton County | 12 | 1836 | Low | Satisfactory |
| Minnewawa Cheshire County | 63 | 1923 | High | Satisfactory |
| Mine Falls Hillsborough County | 16 | 1889 | Low | Satisfactory |
| Milton Waste Water Lagoons Dam Strafford County | 20 | 1985 | Significant | Fair |
| Milton Three Ponds Dam Strafford County | 19 | 1824 | High | Poor |
| Milton Leatherboard Dam Strafford County | 32 | 1904 | Significant | Poor |
| Millville Lake Dam Rockingham County | 20 | 1917 | High | Poor |
| Mill Pond Road Dam Cheshire County | 17 | 1979 | Undetermined | Not Rated |
| Mill Pond Dam Cheshire County | 20 | 1880 | Low | Poor |
| Mill Pond Dam Rockingham County | 13 | 1935 | Low | Satisfactory |
| Mill Pond Dam Cheshire County | 16 | 1937 | Significant | Fair |
| Mill Pond Dam Strafford County | 10 | 1935 | Low | Poor |
| Millen Lake Dam Sullivan County | 23 | 1970 | Significant | Satisfactory |
| Middle Hancock LLC Dam Hillsborough County | 9 | 1976 | Low | Fair |
| Merrymeeting Lake Dam Strafford County | 22 | 1924 | High | Poor |
| Merrimack River Right Bank Fdr Hillsborough County | 15 | 1949 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.