New Jersey Dams
830 dams tracked by the National Inventory of Dams
Total Dams
830
High Hazard
232
28%
Poor / Unsatisfactory
233
Average Age
95 yrs
Hazard Classification
High232 (28.0%)
Significant332 (40.0%)
Low266 (32.0%)
Condition Assessment
Satisfactory373 (44.9%)
Fair112 (13.5%)
Poor / Unsatisfactory233 (28.1%)
Not Rated112 (13.5%)
Federal
21
State
126
Local
287
Private
393
Tallest Dams
- Merrill Creek Main Dam280 ft
- Round Valley South Dam178 ft
- Monksville Dam150 ft
- Round Valley North Dam135 ft
- Boonton Dam120 ft
High Hazard Dams
Poor Condition Dams
All Dams in New Jersey
Showing 726–750 of 830
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Suntan Lake Dam Morris County | — | — | Significant | Not Rated |
| Surprise Lake Dam Union County | 20 | 1928 | Low | Satisfactory |
| Swannanoa Lake #1 (South) Dam Morris County | 15 | 1914 | High | Satisfactory |
| Swannanoa Lake #2 (North) Dam Morris County | 11 | 1914 | High | Satisfactory |
| Swartswood Lake Dam Sussex County | 16 | 1903 | Low | Fair |
| Swimming River Reservoir Dam Monmouth County | 45 | 1901 | High | Satisfactory |
| Sylva Lake Dam Mercer County | 10 | 1923 | Significant | Fair |
| Sylvan Lake Dam Burlington County | 18 | 1941 | High | Satisfactory |
| Tall Pines Farm Dam Sussex County | 23 | 1957 | Significant | Satisfactory |
| Tarkiln Pond Dam Cape May County | 7 | — | Significant | Satisfactory |
| Tennents Brook Dam Middlesex County | 9 | 1890 | Low | Satisfactory |
| Terrace Lake Dam Morris County | 7 | — | Significant | Satisfactory |
| Thomas Rich Dam Sussex County | 13 | 1926 | Low | Not Rated |
| Thundergust Pond Dam Salem County | 13 | — | Significant | Fair |
| Thundergut Pond Dam Salem County | 13 | 1955 | Low | Poor |
| Timber Lake Dam Burlington County | 19 | 1955 | High | Satisfactory |
| Timber Lakes Dam Gloucester County | 8 | — | Low | Satisfactory |
| Tinton Manor Dam Monmouth County | 13 | — | Low | Not Rated |
| Tomahawk Lake Dam Sussex County | 14 | — | Low | Not Rated |
| Tomlinson Mill Dam Burlington County | 11 | — | Significant | Satisfactory |
| Trenton Reservoir Dam Mercer County | 52 | 1899 | High | Fair |
| Turn Mill Pond Dam Ocean County | 13 | — | Low | Fair |
| Union Lake Dam Cumberland County | 35 | 1869 | High | Poor |
| Union Mill Lake Dam Burlington County | 13 | — | Significant | Satisfactory |
| Untermeyer Dam Morris County | 23 | 1927 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.