Dams in Mercer County, New Jersey
25Total Dams
8High Hazard
8Significant
Dam Safety in Mercer County, New Jersey
Mercer County has 25 dams tracked in the National Inventory of Dams. Of these, 8 are classified as high hazard — meaning failure would probably cause loss of human life. Another 8 carry a significant hazard classification. Currently, 2 dams have a condition assessment of poor or unsatisfactory.
The average dam in Mercer County is 88 years old. The most common purpose is flood risk reduction. The tallest dam is Trenton Reservoir Dam at 52 ft.
Explore more: Oldest dams in New Jersey · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Trenton Reservoir Dam | High | Fair | 52 | Water Supply | 1899 |
| Assunpink # 6 Dam | High | Satisfactory | 31 | Flood Risk Reduction | 1975 |
| Stony Brook Water Shed #7 (hunt Lake) Dam | High | Poor | 28 | Irrigation | 1959 |
| Assunpink #20 Dam | High | Satisfactory | 26 | Flood Risk Reduction | |
| Assunpink #21 Dam | High | Satisfactory | 25 | Flood Risk Reduction | |
| Assunpink #8 Dam | High | Poor | 20 | Water Supply | |
| Stony Brook #14 (honey Lake) Dam | High | Satisfactory | 18 | Flood Risk Reduction | 1964 |
| Peddie Lake Dam | High | Satisfactory | 15 | Recreation | 1923 |
| Carnegie Lake Dam | Significant | Satisfactory | 28 | Recreation | 1900 |
| Regional Stormwater Detention Basin G Dam | Significant | Satisfactory | 18 | Flood Risk Reduction | 1989 |
| Smoyer Park Dam | Significant | Satisfactory | 15 | ||
| Grover's Mill Dam | Significant | Fair | 15 | Recreation | 1931 |
| Ceva Lake Dam | Significant | Satisfactory | 14 | Recreation | 1920 |
| Lower Mountain Lake Dam | Significant | Satisfactory | 13 | Recreation | |
| Scotch Road Detention Dam 1.2 | Significant | Satisfactory | 12 | Flood Risk Reduction | |
| Sylva Lake Dam | Significant | Fair | 10 | Recreation | 1923 |
| Stony Brook #3 (rosedale Lake) Dam | Low | Satisfactory | 28 | Flood Risk Reduction | |
| Squibb Dam | Low | Satisfactory | 26 | Flood Risk Reduction | |
| Gropps Lake Dam | Low | Satisfactory | 25 | Recreation | 1900 |
| Stony Brook #4 (curlis Lake) Dam | Low | Satisfactory | 24 | Flood Risk Reduction | 1959 |
| Stony Brook #2 (willow Lake) Dam | Low | Satisfactory | 15 | Recreation | 1959 |
| Stony Brook W.s. # 5 (baldwin) Dam | Low | Fair | 14 | Flood Risk Reduction | |
| Colonial Lake Dam | Low | Fair | 12 | Recreation | 1925 |
| Etra Mill Dam | Low | 11 | Recreation | 1930 | |
| Matrix Detention Basin | Low | 8 | Flood Risk Reduction |