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 226–250 of 267
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Stone Pond Overflow Dam Cheshire County | 6 | — | Low | Satisfactory |
| Storrs Pond Dam Grafton County | 34 | 1934 | Significant | Satisfactory |
| Sugar River I Sullivan County | 18 | 1928 | Significant | Satisfactory |
| Sugar River Ii Sullivan County | 10 | 2009 | Significant | Satisfactory |
| Sunapee Sullivan County | 15 | 1856 | Significant | Satisfactory |
| Sunrise Lake Dam Strafford County | 19 | 1877 | High | Satisfactory |
| Swains Lake Dam Strafford County | 17 | 1890 | High | Satisfactory |
| Sweetwater Sullivan County | 33 | 1922 | Significant | Satisfactory |
| Tannery Pond Dam Merrimack County | 12 | 1850 | Low | Satisfactory |
| Taylor River Pond Dam Rockingham County | 19 | 1949 | High | Satisfactory |
| Thorndike Pond Dam Cheshire County | 13 | 1915 | Low | Satisfactory |
| Thornwood Commons Pond Dam Strafford County | 16 | 1961 | Significant | Satisfactory |
| Three Mile Reservoir Dam Cheshire County | 20 | 1986 | High | Satisfactory |
| Tower Hill Pond Dam Rockingham County | 35 | 1938 | High | Satisfactory |
| Troy Sewage Lagoons Dam Cheshire County | 16 | 1983 | Significant | Satisfactory |
| Turkey Pond Dam Merrimack County | 15 | 1958 | High | Satisfactory |
| Uncanoonuc Lake Dam Hillsborough County | 10 | 1936 | High | Satisfactory |
| Unh Water Treament Residual Lagoons Strafford County | 5 | 2017 | Significant | Satisfactory |
| Union Street Hillsborough County | 15 | 1916 | Significant | Satisfactory |
| Vernon Cheshire County | 58 | 1909 | Low | Satisfactory |
| Village Pond Dam Cheshire County | 12 | 1915 | Low | Satisfactory |
| Washburn Corners Dam Sullivan County | 14 | 1950 | Low | Satisfactory |
| Wason Pond Dam Rockingham County | 18 | 1931 | Low | Satisfactory |
| Waterloom Falls Hillsborough County | 18 | 1980 | Low | Satisfactory |
| Waterville Valley Lagoons Dam Grafton County | 19 | 1972 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.