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 76–100 of 266
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Fallen Leaf Lake Dam Burlington County | 10 | 1954 | Low | Not Available |
| Franklin Lake Dam Monmouth County | 10 | — | Low | Poor |
| French Lake Dam Warren County | 10 | 1945 | Low | Not Rated |
| Gale Dam Burlington County | 15 | 1970 | Low | Poor |
| Gateway Business Park Dam Salem County | 13 | — | Low | Not Rated |
| Gaunts Reservoir Dam Ocean County | 8 | — | Low | Not Rated |
| Glauberman Lake Dam Sussex County | 13 | 1933 | Low | Not Rated |
| Glen Lake Dam Gloucester County | 25 | 1900 | Low | Not Rated |
| Great Falls Passaic County | 12 | 1840 | Low | Satisfactory |
| Green Branch Dam Ocean County | 11 | — | Low | Not Rated |
| Green Pond Reservoir Dam Morris County | 15 | — | Low | Not Rated |
| Griffith Dam Morris County | 9 | — | Low | Not Rated |
| Gropps Lake Dam Mercer County | 25 | 1900 | Low | Satisfactory |
| Harrison Mountain Lake Dam Passaic County | 15 | 1930 | Low | Not Rated |
| Hawthorne Lake Dam Sussex County | 8 | 1900 | Low | Satisfactory |
| Hemlock Pond Dam Sussex County | 15 | — | Low | Not Rated |
| Herzenberg Dam Sussex County | 16 | 1960 | Low | Not Rated |
| Hipps Folley Dam Burlington County | 15 | 1967 | Low | Not Available |
| Holiday Lake Dam Ocean County | 16 | 1965 | Low | Fair |
| Holstein Lake Dam Morris County | 15 | 1875 | Low | Not Rated |
| Hunterdon Learning Center Dam Hunterdon County | 35 | 1971 | Low | Not Rated |
| Indian Lake Dam Morris County | 19 | 1921 | Low | Satisfactory |
| Island Farm Weir Dam Somerset County | 8 | — | Low | Satisfactory |
| Jefferson Lake Dam Sussex County | 15 | — | Low | Poor |
| Jefferson Lake Dike Sussex County | 14 | — | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.