15Total Dams
0High Hazard
4Significant
Dam Safety in Suffolk County, New York
Suffolk County has 15 dams tracked in the National Inventory of Dams. Another 4 carry a significant hazard classification. Currently, 3 dams have a condition assessment of poor or unsatisfactory.
The average dam in Suffolk County is 117 years old. The most common purpose is recreation. The tallest dam is New Mill Pond Dam at 15 ft.
Explore more: Oldest dams in New York · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Willow Pond Dam | Significant | Poor | 12 | Recreation | 1915 |
| Peconic River Sportsman Club Dam | Significant | Satisfactory | 11 | Other | 1925 |
| Phillips Mill Pond Dam | Significant | Poor | 10 | Recreation | 1850 |
| Lotus Lake Dam | Significant | Poor | 6 | Recreation | 1980 |
| New Mill Pond Dam | Low | Not assessed | 15 | Recreation | 1825 |
| Peconic Lake Dam | Low | Not assessed | 13 | Recreation | 1915 |
| Lower Lake Dam | Low | Not assessed | 12 | Recreation | 1940 |
| Great Patchogue Lake Dam | Low | Not assessed | 11 | Recreation | 1917 |
| Mill Pond Dam | Low | Not assessed | 11 | Other | 1920 |
| Belmont Lake Dam | Low | Not assessed | 9 | Recreation | 1905 |
| Upper Lake Dam | Low | Not assessed | 8 | Recreation | 1932 |
| Lefferts Grist Mill Dam | Low | Not assessed | 8 | Recreation | 1800 |
| Canaan Lake Dam | Low | Not assessed | 7 | Recreation | 1912 |
| Fresh Pond Dam | Low | Not assessed | 7 | Recreation | 1945 |
| Millers Pond Dam | Low | Not assessed | 7 | Recreation | 1940 |