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 226–232 of 232
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Assunpink #8 Dam Mercer County | 20 | — | High | Poor |
| Assunpink # 6 Dam Mercer County | 31 | 1975 | High | Satisfactory |
| Assunpink #4 Dam Monmouth County | 24 | — | High | Poor |
| Assunpink #21 Dam Mercer County | 25 | — | High | Satisfactory |
| Assunpink #20 Dam Mercer County | 26 | — | High | Satisfactory |
| Assunpink #18 Dam Monmouth County | 38 | — | High | Poor |
| Allentown Dam Monmouth County | 18 | — | High | 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.