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 326–332 of 332
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Amwell No. 1 Dam Hunterdon County | 22 | — | Significant | Satisfactory |
| Amwell #2 Dam Hunterdon County | 19 | — | Significant | Satisfactory |
| Almonesson Lake Dam Gloucester County | 24 | 1926 | Significant | Poor |
| Alloway Lake Dam Salem County | 20 | 1949 | Significant | Satisfactory |
| Allamuchy Pond Dam Warren County | 13 | — | Significant | Poor |
| Algonkin Dam Salem County | 14 | 1924 | Significant | Poor |
| Alcyon Lake Dam Gloucester County | 12 | 1943 | 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.