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 1–25 of 112
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Yardley Road Lake Dam Morris County | 30 | — | High | Fair |
| Willow Grove Dam Salem County | 10 | — | Significant | Fair |
| Whites Pond Dam Bergen County | 11 | 1938 | Low | Fair |
| Westons Arch Dam Middlesex County | 17 | 1919 | Significant | Fair |
| Weston Mill Pond Dam Middlesex County | 16 | 1916 | Significant | Fair |
| West Creek Dam Cape May County | 10 | — | Significant | Fair |
| Wawayanda Lake Dam Sussex County | 14 | — | High | Fair |
| Wallkill Lake Dam Sussex County | 15 | 1930 | Low | Fair |
| Wagush Levee Dam Burlington County | 8 | — | High | Fair |
| Upper Pond Dam Monmouth County | — | — | Significant | Fair |
| Upper Highland Lake Dam Sussex County | 18 | 1940 | High | Fair |
| Turn Mill Pond Dam Ocean County | 13 | — | Low | Fair |
| Trenton Reservoir Dam Mercer County | 52 | 1899 | High | Fair |
| Thundergust Pond Dam Salem County | 13 | — | Significant | Fair |
| Sylva Lake Dam Mercer County | 10 | 1923 | Significant | Fair |
| Swartswood Lake Dam Sussex County | 16 | 1903 | Low | Fair |
| Sunset Lake Dam Cumberland County | 20 | 1927 | High | Fair |
| Sullivan Pond Dam Hunterdon County | 19 | 1959 | High | Fair |
| Stony Lake Dam Sussex County | 17 | 1926 | Low | Fair |
| Stony Brook W.S. # 5 (Baldwin) Dam Mercer County | 14 | — | Low | Fair |
| Stephens Lake Dam Passaic County | 12 | — | Significant | Fair |
| Steenykill Lake Dam Sussex County | 25 | 1938 | High | Fair |
| Stafford Forge Dam Ocean County | 9 | 1944 | Significant | Fair |
| Silver Lake Dam Camden County | 10 | — | Significant | Fair |
| Shaws Mill Pond Dam Cumberland County | 15 | — | Significant | Fair |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.