42Total Dams
13High Hazard
15Significant
Dam Safety in Herkimer County, New York
Herkimer County has 42 dams tracked in the National Inventory of Dams. Of these, 13 are classified as high hazard — meaning failure would probably cause loss of human life. Another 15 carry a significant hazard classification. Currently, 9 dams have a condition assessment of poor or unsatisfactory.
The average dam in Herkimer County is 108 years old. The most common purpose is hydroelectric. The tallest dam is Moshier at 93 ft.
Explore more: Oldest dams in New York · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Moshier | High | Satisfactory | 93 | Hydroelectric | 1930 |
| Hinckley | High | Satisfactory | 83 | Hydroelectric | 1914 |
| Ilion Reservoir #3 Dam | High | Poor | 76 | Water Supply | 1921 |
| East Canada Lake Dam | High | Poor | 65 | Hydroelectric | 1924 |
| Ilion Reservoir #2 Dam | High | Poor | 60 | Water Supply | 1903 |
| Prospect | High | Satisfactory | 52 | Hydroelectric | 1959 |
| Ilion Reservoir #1 Dam | High | Poor | 40 | Water Supply | 1895 |
| Beaver Brook Site #1 Dam | High | Poor | 36 | Flood Risk Reduction | 2002 |
| North Lake B Dam | High | Not assessed | 35 | Navigation | 1850 |
| South Lake Dam | High | Satisfactory | 30 | Recreation | 1901 |
| North Lake C Dam | High | Satisfactory | 27 | Navigation | 1850 |
| Mirror Lake Dam | High | Fair | 25 | Flood Risk Reduction | |
| Woodhull Lake Dam | High | Satisfactory | 25 | Navigation | 1853 |
| Lock E-17 Dam at Little Falls | Significant | Not assessed | 60 | Hydroelectric | 1982 |
| Graffenburg Reservoir Dam | Significant | Satisfactory | 55 | Recreation | 1854 |
| Lock E-17 Embankment Dam | Significant | Not assessed | 50 | Hydroelectric | 1918 |
| Frankfort Reservoir Dam | Significant | Poor | 45 | Water Supply | 1908 |
| Little Falls Reservoir Dam | Significant | Satisfactory | 42 | Water Supply | 1901 |
| Little Falls Dist Reservoir Dam | Significant | Satisfactory | 32 | Water Supply | 1960 |
| Finches Pond Lower Dam | Significant | Not assessed | 20 | Other | |
| Stillwater - South Dam | Significant | Satisfactory | 20 | Hydroelectric | 1924 |
| Spruce Lake Dam | Significant | Poor | 18 | Water Supply | 1897 |
| Finches Pond Upper Dam | Significant | Poor | 18 | Other | |
| Old Forge Reservoir Dam | Significant | Poor | 18 | Recreation | 1905 |
| Newport | Significant | Satisfactory | 12 | Hydroelectric | 1912 |
| Movable Dam at Herkimer | Significant | Not assessed | 6 | Navigation | 1915 |
| Movable Dam at Rocky Rift | Significant | Not assessed | 6 | Navigation | 1926 |
| Little Falls State Dam - North | Significant | Satisfactory | 6 | Hydroelectric | 1894 |
| Sand Lake Dam | Low | Not assessed | 30 | Navigation | 1901 |
| Klondike Reservoir Dam | Low | Not assessed | 29 | Water Supply | 1898 |
| George R Cogar Pond Dam | Low | Not assessed | 29 | Recreation | 1974 |
| Christian Lake Dam | Low | Not assessed | 23 | Recreation | 1973 |
| Millers Mills Dam | Low | Not assessed | 20 | Recreation | 1917 |
| Daniel Green Company Dam | Low | Not assessed | 20 | Hydroelectric | 1917 |
| Dolgeville | Low | Satisfactory | 20 | Hydroelectric | 1897 |
| North Lake a Dam (spillway) | Low | Not assessed | 15 | Navigation | 1850 |
| Thendara Dam | Low | Not assessed | 12 | Recreation | 1980 |
| Maple Lake Dam | Low | Not assessed | 12 | Recreation | 1905 |
| Herkimer | Low | Satisfactory | 12 | Hydroelectric | 1922 |
| Kehler Dam | Low | Not assessed | 11 | Fish and Wildlife Pond | 2002 |
| Jerseyfield Lake Dam | Low | Not assessed | 9 | Fire Protection, Stock, Or Small Fish Pond | |
| Second Bisby Lake Dam | Low | Not assessed | 8 | Recreation | 1914 |