130Total Dams
18High Hazard
91Significant
Dam Safety in New London County, Connecticut
New London County has 130 dams tracked in the National Inventory of Dams. Of these, 18 are classified as high hazard — meaning failure would probably cause loss of human life. Another 91 carry a significant hazard classification. Currently, 17 dams have a condition assessment of poor or unsatisfactory.
The average dam in New London County is 123 years old. The most common purpose is recreation. The tallest dam is Deep River Reservoir Dam at 62 ft.
Explore more: Oldest dams in Connecticut · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Deep River Reservoir Dam | High | Satisfactory | 62 | Water Supply | 1926 |
| Taftville Hydro Dam #4 | High | Satisfactory | 41 | Hydroelectric | 1867 |
| Mystic Reservoir Dam | High | Satisfactory | 34 | Water Supply | 1880 |
| Fairview Reservoir Dam and Dikes | High | Satisfactory | 30 | Water Supply | 1868 |
| Hanover Reservoir Dam | High | Fair | 27 | Recreation | 1900 |
| Glasgo Pond Dam | High | Satisfactory | 26 | Recreation | 1860 |
| Oxoboxo Lake Dam | High | Satisfactory | 26 | Recreation | 1810 |
| Ashland Pond Dam | High | Satisfactory | 25 | Recreation | 1800 |
| Fitchville Pond Dam | High | Poor | 20 | Recreation | 1871 |
| Poquonnock Reservoir Dam | High | Satisfactory | 18 | Water Supply | 1901 |
| Pachaug Pond Dam | High | Fair | 17 | Fish and Wildlife Pond | 1888 |
| Spaulding Pond Dike | High | Satisfactory | 16 | Other | 1965 |
| Skating Pond Dam | High | Satisfactory | 16 | Flood Risk Reduction | 1968 |
| Deans Reservoir Dam | High | Fair | 15 | Water Supply | 1888 |
| Silvia's Lower Pond Dam | High | Poor | 14 | Fish and Wildlife Pond | |
| Pataguanset Lake Dam | High | Fair | 12 | Recreation | 1942 |
| Sawmill Pond Dam | High | Satisfactory | 12 | Recreation | 1870 |
| Silvia's Upper Pond Dam | High | Fair | 12 | Recreation | 1870 |
| Morgan Pond Dam | Significant | Satisfactory | 45 | Water Supply | 1966 |
| Stony Brook Reservoir Dam | Significant | Fair | 40 | Water Supply | 1912 |
| Stone Hill Reservoir Dam | Significant | Satisfactory | 35 | Water Supply | 1894 |
| Congdon Pond Dam | Significant | Poor | 35 | Hydroelectric | 1900 |
| Trading Cove Pond Dam | Significant | Fair | 32 | Recreation | 1900 |
| Green Falls Reservoir Dam | Significant | Satisfactory | 32 | Recreation | 1870 |
| Tunnel Dam Hydro Station | Significant | Satisfactory | 32 | Hydroelectric | 1906 |
| City Pond Dam | Significant | Poor | 31 | Recreation | |
| Taftville Reservoir #2 Dam | Significant | Poor | 30 | Water Supply | 1910 |
| Taftville Reservoir #1 Dam | Significant | Fair | 30 | Recreation | 1880 |
| Baltic Reservoir Dam (west) | Significant | Satisfactory | 30 | Water Supply | 1900 |
| Paper Mill Pond Dam | Significant | Poor | 28 | Water Supply | 1870 |
| Williams Pond Dam | Significant | Satisfactory | 26 | Recreation | 1865 |
| Powers Lake Dam | Significant | Poor | 25 | Recreation | 1870 |
| Tadma Pond Dam | Significant | Poor | 22 | Recreation | 1966 |
| Gager's Pond Dam | Significant | Poor | 22 | Recreation | 1876 |
| Dodson Pond Dam | Significant | Fair | 22 | Recreation | 1962 |
| Bogue Brook Reservoir Dam | Significant | Satisfactory | 21 | Water Supply | 1920 |
| Wheeler Pond Dam | Significant | Fair | 20 | Other | 1810 |
| Stiles Pond Dam | Significant | Not assessed | 20 | Recreation | 1870 |
| Miller Pond Dam | Significant | Satisfactory | 20 | Recreation | 1873 |
| Billings Avery Dam | Significant | Satisfactory | 19 | Water Supply | 1968 |
| Gay Cemetery Pond Dam | Significant | Poor | 19 | Recreation | 1920 |
| Norwich State Hospital Pond Dam | Significant | Satisfactory | 19 | Recreation | |
| Hopeville Pond Dam | Significant | Satisfactory | 18 | Recreation | 1910 |
| Savin Lake Dam | Significant | Fair | 18 | Recreation | 1920 |
| Rubber Pond Dam | Significant | Not assessed | 18 | Recreation | |
| Red Mill Pond Dam | Significant | Satisfactory | 18 | Other | |
| Lithuanian Scout Association Pond Dam | Significant | Satisfactory | 18 | Recreation | |
| Fairy Lake Dike | Significant | Fair | 17 | Water Supply | 1957 |
| Bog Meadow Reservoir Dam | Significant | Poor | 17 | Recreation | 1893 |
| Poheganut Reservoir Dam | Significant | Satisfactory | 16 | Water Supply | 1952 |
| Whippoorwill Pond Dam | Significant | Satisfactory | 16 | Recreation | |
| Crossing at Lisbon Detention Dam | Significant | Satisfactory | 16 | Flood Risk Reduction | 2008 |
| Wyassup Lake Dam | Significant | Satisfactory | 15 | Recreation | 1920 |
| Lake of Isles Dam | Significant | Fair | 15 | Recreation | 1920 |
| Brandagee Lake Dam | Significant | Fair | 15 | Recreation | 1897 |
| Versailles Pond Dam | Significant | Fair | 14 | Water Supply | 1920 |
| Lower Blissville Pond Dam | Significant | Satisfactory | 14 | Recreation | 1860 |
| Moulsons Pond Dam | Significant | Not assessed | 14 | Recreation | 1840 |
| Lower Millpond Dam | Significant | Satisfactory | 14 | Recreation | |
| Brewster Pond Dam | Significant | Poor | 13 | Recreation | 1854 |
| Hallville Pond Dam | Significant | Fair | 13 | Recreation | 1920 |
| Brodie Pond Dam | Significant | Not assessed | 13 | Recreation | |
| Watersedge Pond Dam | Significant | Fair | 13 | Recreation | 1966 |
| Smith Pond Dam | Significant | Not assessed | 13 | Recreation | |
| Beach Pond Dam | Significant | Satisfactory | 12 | Recreation | 1885 |
| Upper Pond Dam | Significant | Satisfactory | 12 | Recreation | 1860 |
| Spencer Pond Dam | Significant | Poor | 12 | Recreation | 1900 |
| Billings Lake Dam | Significant | Satisfactory | 12 | Recreation | 1900 |
| Bush Pond Dam | Significant | Fair | 12 | Recreation | |
| Graves Dam | Significant | Satisfactory | 11 | Recreation | |
| Gallup Pond Dam | Significant | Fair | 11 | Other | 1910 |
| Clark Falls Dam | Significant | Fair | 11 | Other | |
| Upper Millpond Dam | Significant | Satisfactory | 11 | Recreation | 1820 |
| Gardner Lake Dam | Significant | Satisfactory | 10 | Recreation | 1900 |
| Barnes Reservoir Dike | Significant | Poor | 10 | Water Supply | 1902 |
| Ledyard Reservoir South Dam | Significant | Satisfactory | 10 | Water Supply | |
| Schofield Pond Dam | Significant | Not assessed | 10 | Recreation | 1920 |
| Blue Lake Dam | Significant | Satisfactory | 10 | Recreation | 1900 |
| E.a. Whiteford Dam | Significant | Satisfactory | 10 | Recreation | 1964 |
| Rockland Pond Dam | Significant | Satisfactory | 10 | Water Supply | 1900 |
| Falls Mill Upper Dam | Significant | Not assessed | 10 | Recreation | 1910 |
| Great Meadow Brook Pond Dam | Significant | Fair | 10 | Recreation | |
| Beachdale Pond Dam | Significant | Satisfactory | 9 | Recreation | |
| Beckwith Pond Dam | Significant | Satisfactory | 9 | Recreation | |
| Shunock River Dam | Significant | Not assessed | 9 | Other | |
| Red Cedar Lake Dam | Significant | Fair | 9 | Recreation | 1900 |
| Baltic Reservoir Dam (east) | Significant | Poor | 9 | Water Supply | |
| Mitchell Pond Dam | Significant | Not assessed | 9 | Recreation | |
| Lantern Hill Pond Dam | Significant | Satisfactory | 9 | Recreation | |
| Gorton Pond Dam | Significant | Fair | 8 | Recreation | 1860 |
| Babcock Pond Dam #1 | Significant | Satisfactory | 8 | Recreation | 1880 |
| Wickaboxet Marsh Dam | Significant | Satisfactory | 8 | Recreation | 1962 |
| Darrow Pond Dam | Significant | Fair | 8 | Recreation | 1880 |
| Lake Konomoc Dike | Significant | Satisfactory | 8 | Water Supply | 1969 |
| Dolbeare Dam | Significant | Not assessed | 7 | Other | |
| Beaver Brook Pond | Significant | Fair | 7 | Recreation | |
| Rogers Lake Dam | Significant | Satisfactory | 7 | Recreation | 1822 |
| Spaulding Pond Dam | Significant | Fair | 7 | Recreation | 1900 |
| Yellow Mill Dam | Significant | Not assessed | 6 | Other | |
| Oakdale Pond Dam | Significant | Not assessed | 6 | Water Supply | |
| Lincoln Lake | Significant | Not assessed | 6 | Recreation | 1900 |
| Long Pond Dam | Significant | Fair | 6 | Recreation | 1880 |
| Border Pond Dam | Significant | Satisfactory | 6 | Other | |
| Cradnall Property Dam | Significant | Not assessed | 5 | Recreation | |
| Liepold Pond Dam | Significant | Not assessed | 5 | Recreation | |
| Mohegan Brook Dam | Significant | Satisfactory | 5 | Recreation | |
| Perry Pond Dam | Significant | Not assessed | 5 | Recreation | |
| Douglas Pond Dam | Significant | Not assessed | 4 | Recreation | |
| Pitcher Mountain Pond Dam | Significant | Not assessed | 4 | Other | |
| Tantaquidgeon | Low | Satisfactory | 30 | Recreation | |
| Pine Meadows Park Pond Pond Dam | Low | Not assessed | 22 | Recreation | 1959 |
| Wyre - Wynd | Low | Satisfactory | 21 | Hydroelectric | 1913 |
| Drabik Pond Dam | Low | Not assessed | 15 | Irrigation | |
| Greenville | Low | Satisfactory | 15 | Hydroelectric | 1888 |
| Occum | Low | Satisfactory | 14 | Hydroelectric | 1900 |
| Witch Meadow Pond Dam | Low | Not assessed | 13 | Recreation | 1965 |
| Blissville Pond Dam | Low | Not assessed | 11 | Recreation | 1930 |
| Mcgrath Dam | Low | Not assessed | 10 | Recreation | 1900 |
| Macdonald Swamp Pond | Low | Not assessed | 10 | Other | |
| Hell Hollow Pond Dam | Low | Fair | 10 | Fish and Wildlife Pond | |
| Day Pond(colchester) | Low | Not assessed | 10 | Recreation | 1936 |
| Poquonock Lake Dam | Low | Not assessed | 10 | Water Supply | |
| Lake Nova | Low | Not assessed | 8 | Recreation | 1930 |
| Mill Pond Dam | Low | Poor | 8 | Water Supply | |
| Still Waters Pond Dam | Low | Not assessed | 8 | Other | |
| Beaver Brook Dam | Low | Not assessed | 8 | Fish and Wildlife Pond | 1968 |
| Whitford Pond Dam | Low | Poor | 7 | Recreation | |
| Lake Cuheca Dam | Low | Not assessed | 7 | Recreation | 1900 |
| Ymca Pond Dam | Low | Not assessed | 7 | Recreation | 1920 |
| Jordan Mill Pond Dam | Low | Not assessed | 7 | Recreation | 1900 |