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 373
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Alcyon Lake Dam Gloucester County | 12 | 1943 | Significant | Satisfactory |
| Allentown Dam Monmouth County | 18 | — | High | Satisfactory |
| Alloway Lake Dam Salem County | 20 | 1949 | Significant | Satisfactory |
| Amwell #2 Dam Hunterdon County | 19 | — | Significant | Satisfactory |
| Amwell No. 1 Dam Hunterdon County | 22 | — | Significant | Satisfactory |
| Amwell No. 3 Dam Hunterdon County | 26 | 1970 | Significant | Satisfactory |
| Apshawa Auxiliary Dam Passaic County | 16 | — | Significant | Satisfactory |
| Apshawa Main Dam Passaic County | 22 | 1912 | Significant | Satisfactory |
| Assunpink #20 Dam Mercer County | 26 | — | High | Satisfactory |
| Assunpink #21 Dam Mercer County | 25 | — | High | Satisfactory |
| Assunpink #5 Dam Monmouth County | 13 | — | Low | Satisfactory |
| Assunpink # 6 Dam Mercer County | 31 | 1975 | High | Satisfactory |
| Atco Lake Dam Camden County | 8 | — | Significant | Satisfactory |
| Ballinger Lake Dam Burlington County | 11 | — | High | Satisfactory |
| Bankbridge Dam Gloucester County | 21 | — | Low | Satisfactory |
| Barry Lakes #2 Dam Sussex County | 12 | 1955 | Low | Satisfactory |
| Bass Lake Dam Warren County | 30 | 1911 | High | Satisfactory |
| Bayberry Street Dam Burlington County | — | — | Significant | Satisfactory |
| Bear Brook Dam Essex County | 20 | 1979 | Significant | Satisfactory |
| Bear Pond Dam A Sussex County | 16 | 1905 | Significant | Satisfactory |
| Bear Pond Dam B Sussex County | 10 | 1900 | Significant | Satisfactory |
| Bear Pond Dam D Sussex County | 33 | 1905 | Low | Satisfactory |
| Beatties Mill Dam Passaic County | 12 | 1932 | Low | Satisfactory |
| Beaver Lake Dam Sussex County | 12 | 1770 | Low | Satisfactory |
| Bennetts Mills Dam Ocean County | 23 | — | Significant | Satisfactory |
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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.