Dams in Herkimer County, New York
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 Rated | 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 Rated | 60 | Hydroelectric | 1982 |
| Graffenburg Reservoir Dam | Significant | Satisfactory | 55 | Recreation | 1854 |
| Lock E-17 Embankment Dam | Significant | Not Rated | 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 Rated | 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 Rated | 6 | Navigation | 1915 |
| Movable Dam At Rocky Rift | Significant | Not Rated | 6 | Navigation | 1926 |
| Little Falls State Dam - North | Significant | Satisfactory | 6 | Hydroelectric | 1894 |
| Sand Lake Dam | Low | Not Rated | 30 | Navigation | 1901 |
| Klondike Reservoir Dam | Low | Not Rated | 29 | Water Supply | 1898 |
| George R Cogar Pond Dam | Low | Not Rated | 29 | Recreation | 1974 |
| Christian Lake Dam | Low | Not Rated | 23 | Recreation | 1973 |
| Millers Mills Dam | Low | Not Rated | 20 | Recreation | 1917 |
| Daniel Green Company Dam | Low | Not Rated | 20 | Hydroelectric | 1917 |
| Dolgeville | Low | Satisfactory | 20 | Hydroelectric | 1897 |
| North Lake A Dam (spillway) | Low | Not Rated | 15 | Navigation | 1850 |
| Thendara Dam | Low | Not Rated | 12 | Recreation | 1980 |
| Maple Lake Dam | Low | Not Rated | 12 | Recreation | 1905 |
| Herkimer | Low | Satisfactory | 12 | Hydroelectric | 1922 |
| Kehler Dam | Low | Not Rated | 11 | Fish and Wildlife Pond | 2002 |
| Jerseyfield Lake Dam | Low | Not Rated | 9 | Fire Protection, Stock, Or Small Fish Pond | |
| Second Bisby Lake Dam | Low | Not Rated | 8 | Recreation | 1914 |