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 151–169 of 169
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Supply Pond Dam Hillsborough County | 28 | 1854 | High | Fair |
| Swanzey Lake Dam Cheshire County | 12 | 1790 | Low | Fair |
| Taylor Pond Dam Hillsborough County | 12 | 1965 | Low | Fair |
| Tyler Tree Farm Dam Grafton County | 25 | 1969 | Significant | Fair |
| Uncanoonuc Lake Dike Hillsborough County | 15 | 1954 | High | Fair |
| Upper City Dam Strafford County | 14 | 1920 | Significant | Fair |
| Upper Mountain Lake Dam Grafton County | 31 | 1963 | Low | Fair |
| Upper Peverly Pond Dam Rockingham County | 11 | 1935 | Low | Fair |
| Upper Recreation Pond Dam Belknap County | 14 | 1970 | Low | Fair |
| Upper Reservoir Dam Grafton County | 30 | 1924 | High | Fair |
| Van Dyke Dam Cheshire County | 8 | 1982 | Low | Fair |
| Wendall Marsh Dam Sullivan County | 15 | — | Significant | Fair |
| White Oak Pond Dam Grafton County | 8 | 1920 | Low | Fair |
| Whitewater Brook Dam Sullivan County | 95 | 1968 | High | Fair |
| Wildsong Farm Pond Dam 1 Belknap County | 16 | 1969 | Low | Fair |
| Wildsong Farm Pond Dike Belknap County | 18 | 1969 | Low | Fair |
| Willard Pond Dam Hillsborough County | 8 | 1937 | Low | Fair |
| Wiswall Dam Strafford County | 22 | 1911 | Significant | Fair |
| Wolfeboro Sewage Lagoon Dam Carroll County | 45 | 1975 | High | Fair |
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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.