Dams in St. Lawrence County, New York
40Total Dams
17High Hazard
6Significant
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Long Sault | High | Satisfactory | 132 | Hydroelectric | 1958 |
| Massena Intake | High | Satisfactory | 118 | Hydroelectric | 1958 |
| Rainbow | High | Satisfactory | 82 | Hydroelectric | 1956 |
| Blake | High | Satisfactory | 80 | Hydroelectric | 1957 |
| Flat Rock | High | Satisfactory | 72 | Hydroelectric | 1925 |
| Browns Falls | High | Satisfactory | 70 | Hydroelectric | 1922 |
| Five Falls | High | Satisfactory | 53 | Hydroelectric | 1954 |
| Newton Falls Upper | High | Satisfactory | 50 | Hydroelectric | 1927 |
| South Colton | High | Satisfactory | 42 | Hydroelectric | 1954 |
| Higley | High | Satisfactory | 37 | Hydroelectric | 1925 |
| Allens Falls | High | Satisfactory | 37 | Hydroelectric | 1991 |
| Colton | High | Satisfactory | 29 | Hydroelectric | 1919 |
| Long Sault North | High | Satisfactory | 25 | Hydroelectric | 1958 |
| Norwood | High | Fair | 24 | Hydroelectric | 1928 |
| Piercefield | High | Satisfactory | 22 | Hydroelectric | 1914 |
| East Norfolk | High | Satisfactory | 16 | Hydroelectric | 1928 |
| Ogdensburg | High | Satisfactory | 12 | Hydroelectric | 1910 |
| Iroquois | Significant | Satisfactory | 72 | Hydroelectric | 1958 |
| South Edwards | Significant | Satisfactory | 53 | Hydroelectric | 1914 |
| Heuvelton | Significant | Satisfactory | 35 | Hydroelectric | 1923 |
| Stark Falls Dike A | Significant | Satisfactory | 22 | Hydroelectric | 1957 |
| Carry Falls Dike A | Significant | Satisfactory | 17 | Hydroelectric | 1953 |
| Gouverneur | Significant | Satisfactory | 7 | Hydroelectric | 1925 |
| Sugar Island | Low | Satisfactory | 35 | Hydroelectric | 1925 |
| Hannawa | Low | Satisfactory | 34 | Hydroelectric | 1902 |
| Hollow Dam | Low | Satisfactory | 31 | Hydroelectric | 1987 |
| Pyrites Intake | Low | Satisfactory | 27 | Hydroelectric | 1908 |
| Emeryville | Low | Satisfactory | 25 | Hydroelectric | 1959 |
| Fowler #7 - Dam No. 1 | Low | Satisfactory | 25 | Hydroelectric | 1928 |
| Newton Falls Lower | Low | Satisfactory | 25 | Hydroelectric | 1927 |
| Eel Weir | Low | Satisfactory | 23 | Hydroelectric | 1928 |
| Unionville | Low | Satisfactory | 20 | Hydroelectric | 1907 |
| Parishville | Low | Satisfactory | 19 | Hydroelectric | 1925 |
| Hewittville | Low | Satisfactory | 18 | Hydroelectric | 1870 |
| Raymondville | Low | Satisfactory | 17 | Hydroelectric | 1928 |
| Sissonville | Low | Satisfactory | 16 | Hydroelectric | 1990 |
| Talcville | Low | Satisfactory | 13 | Hydroelectric | 1987 |
| Yaleville | Low | Satisfactory | 12 | Hydroelectric | 1914 |
| Potsdam - West Dam | Low | Satisfactory | 11 | Hydroelectric | 1990 |
| Potsdam - East Dam | Low | Satisfactory | 7 | Hydroelectric | 1903 |