Dams in Grafton County, New Hampshire
82Total Dams
26High Hazard
25Significant
Dam Safety in Grafton County, New Hampshire
Grafton County has 82 dams tracked in the National Inventory of Dams. Of these, 26 are classified as high hazard — meaning failure would probably cause loss of human life. Another 25 carry a significant hazard classification. Currently, 17 dams have a condition assessment of poor or unsatisfactory.
The average dam in Grafton County is 93 years old. The most common purpose is recreation. The tallest dam is Comerford at 170 ft.
Explore more: Oldest dams in New Hampshire · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Comerford | High | Satisfactory | 170 | Hydroelectric | 1930 |
| Moore | High | Satisfactory | 149 | Hydroelectric | 1957 |
| Baker River Site 2 Dam | High | Fair | 68 | Flood Risk Reduction | 1965 |
| Baker River Site 6a Dam | High | Poor | 68 | Flood Risk Reduction | 1975 |
| Baker River Site 8 Dam | High | Satisfactory | 63 | Flood Risk Reduction | 1967 |
| Wilder | High | Satisfactory | 59 | Hydroelectric | 1950 |
| Baker River Site 5 Dam | High | Poor | 53 | Flood Risk Reduction | 1967 |
| Oliverian Dam | High | Satisfactory | 52 | Flood Risk Reduction | 1962 |
| Campton Pond Hydro Dam | High | Fair | 39 | Hydroelectric | 1890 |
| Lower Reservoir Dam | High | Fair | 33 | Water Supply | 1893 |
| Goose Pond Dam | High | Poor | 31 | Recreation | 1918 |
| Upper Reservoir Dam | High | Fair | 30 | Water Supply | 1924 |
| Hanover Center Reservoir Dam | High | Satisfactory | 30 | Water Supply | 1962 |
| Baker River Site 11 Dam | High | Poor | 24 | Flood Risk Reduction | 1971 |
| Baker River Site 11a Dam | High | Satisfactory | 24 | Flood Risk Reduction | 1971 |
| Rivermill Mascoma Hydro Dam | High | Poor | 22 | Hydroelectric | 1920 |
| Dells Pond Outlet Dam | High | Poor | 20 | Recreation | 1935 |
| Mascoma Lake Dam | High | Poor | 18 | Recreation | 1881 |
| Corcoran Pond Dam | High | Satisfactory | 17 | Recreation | 1976 |
| Squam Lake | High | Satisfactory | 17 | Hydroelectric | 1856 |
| Grist Mill Pond Dam | High | Poor | 16 | Hydroelectric | 1924 |
| Pemigewasset River Levee | High | Satisfactory | 15 | Flood Risk Reduction | 1960 |
| Newfound Lake Dam | High | Poor | 12 | Recreation | 1840 |
| Smith Pond Dam | High | Fair | 12 | Recreation | 1830 |
| George Pond Dam | High | Fair | 11 | Recreation | 1911 |
| Spectacle Pond Dam | High | Satisfactory | 7 | Recreation | 1915 |
| Ayers Island | Significant | Satisfactory | 80 | Hydroelectric | 1924 |
| Storrs Pond Dam | Significant | Satisfactory | 34 | Recreation | 1934 |
| Lower Mountain Lake Dam | Significant | Satisfactory | 33 | Recreation | 1967 |
| Tyler Tree Farm Dam | Significant | Fair | 25 | Fish and Wildlife Pond | 1969 |
| Boston Lot Lake Dam | Significant | Satisfactory | 25 | Recreation | 1936 |
| Apthorp | Significant | Satisfactory | 24 | Hydroelectric | 1936 |
| Harris Brook Reservoir Dam | Significant | Poor | 22 | Recreation | 1903 |
| Crystal Lake Dam | Significant | Satisfactory | 22 | Recreation | 1910 |
| Waterville Valley Lagoons Dam | Significant | Satisfactory | 19 | Other | 1972 |
| Lincoln Sewage Lagoon Dam | Significant | Satisfactory | 19 | Other | 1975 |
| Glen Road | Significant | Satisfactory | 17 | Hydroelectric | 1988 |
| Lower Ipc Dam | Significant | Fair | 16 | Recreation | 1930 |
| Lebanon Water Treatment Intake Dam | Significant | Satisfactory | 16 | Water Supply | 1934 |
| Ashland Sewage Lagoon Dam | Significant | Fair | 15 | Other | 1968 |
| Chandler Pond Dam | Significant | Fair | 14 | Recreation | 1939 |
| Weeks Crossing Pond Dam | Significant | Satisfactory | 14 | Recreation | |
| Baker River Site 6 Dam | Significant | Satisfactory | 14 | Flood Risk Reduction | 1969 |
| Canaan Sewage Lagoon Dam | Significant | Satisfactory | 13 | Other | 1991 |
| Bethlehem Sewage Lagoon Dam | Significant | Satisfactory | 13 | Other | 1985 |
| Lisbon Wastewater Lagoons Dam | Significant | Satisfactory | 13 | Other | |
| Woodsville | Significant | Satisfactory | 12 | Hydroelectric | 1827 |
| Long Pond Dam | Significant | Not Rated | 12 | Fish and Wildlife Pond | 1933 |
| Baker Brook Pond Dam | Significant | Poor | 11 | Recreation | 1928 |
| Armington Lake Dam | Significant | Satisfactory | 9 | Recreation | 1900 |
| Dartmouth Skiway Sewage Lagoon Dam | Significant | Satisfactory | 4 | Other | 1967 |
| Locke 2 Dam | Low | Satisfactory | 60 | Recreation | 1969 |
| Upper Mountain Lake Dam | Low | Fair | 31 | Recreation | 1963 |
| Bethlehem Dam | Low | Not Rated | 29 | Recreation | 1926 |
| Montcalm Golf Club Dam | Low | Fair | 27 | Recreation | 1984 |
| Locke 1 Dam | Low | Poor | 27 | Recreation | 1970 |
| Fenn Dam | Low | Unsatisfactory | 25 | Recreation | 1984 |
| Mcindoes | Low | Satisfactory | 25 | Hydroelectric | 1931 |
| Baltic Mills Dam | Low | Not Rated | 21 | Hydroelectric | 1919 |
| Grafton Pond Dam | Low | Fair | 21 | Recreation | 1918 |
| Baker River Site 5 Dike | Low | Satisfactory | 20 | Flood Risk Reduction | 1969 |
| Lower Lisbon | Low | Satisfactory | 18 | Hydroelectric | 1986 |
| Dodge Falls | Low | Satisfactory | 18 | Hydroelectric | 1905 |
| Ammonoosuc River | Low | Satisfactory | 17 | Hydroelectric | 1900 |
| Lcs Settling Ponds 4 And 5 Dam | Low | Not Rated | 15 | Other | 1980 |
| Beaver Pond | Low | Not Rated | 14 | Fish and Wildlife Pond | 1927 |
| Canaan Street Lake Dam | Low | Not Rated | 14 | Recreation | 1917 |
| Dodge Pond Dam | Low | Satisfactory | 13 | Recreation | 1936 |
| Hermit Hill Farm Pond Dam | Low | Satisfactory | 13 | Fish and Wildlife Pond | 1975 |
| Kilton Pond Dam | Low | Fair | 12 | Recreation | 1930 |
| Mirror Lake Dam | Low | Satisfactory | 12 | Recreation | 1836 |
| Reservoir Pond Dam | Low | Poor | 11 | Recreation | 1900 |
| Pearl Lake Dam | Low | Poor | 10 | Recreation | 1930 |
| Cummins Pond Dam | Low | Satisfactory | 10 | Recreation | 1880 |
| Coffin Pond Dam | Low | Poor | 10 | Recreation | 1960 |
| Campton Bog Pond Dam | Low | Fair | 10 | Recreation | 1836 |
| Stinson Lake Dam | Low | Satisfactory | 8 | Recreation | 1780 |
| White Oak Pond Dam | Low | Fair | 8 | Recreation | 1920 |
| Lake Tarleton Dam | Low | Satisfactory | 8 | Recreation | 1800 |
| Echo Lake Dam | Low | Satisfactory | 7 | Recreation | 1990 |
| Ferson Pond Dam | Low | Poor | 7 | Recreation | 1998 |
| Loon Pond Dam | Low | Satisfactory | 7 | Recreation | 1970 |