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 276–300 of 830
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Green Swamp #4 Dam Passaic County | 65 | 1925 | High | Satisfactory |
| Green Turtle Pond Dam Passaic County | 35 | — | High | Fair |
| Greenwood Lake Dam Passaic County | 17 | 1928 | High | Poor |
| Grenloch Lake Dam Gloucester County | 21 | 1907 | Significant | Fair |
| Griffith Dam Morris County | 9 | — | Low | Not Rated |
| Gropps Lake Dam Mercer County | 25 | 1900 | Low | Satisfactory |
| Grover'S Mill Dam Mercer County | 15 | 1931 | Significant | Fair |
| Hackensack Golf Club Dam Bergen County | 12 | 1950 | Significant | Satisfactory |
| Hackensack Res. # 2 (Weehawken) Dam Hudson County | — | — | High | Fair |
| Hackettstown Res. Dam Morris County | 38 | — | High | Poor |
| Haddon Lake Dam Camden County | 20 | 1917 | Significant | Poor |
| Haledon Reservoir Dam Passaic County | 25 | 1919 | High | Satisfactory |
| Hammonton Lake Dam Atlantic County | 13 | 1902 | Significant | Poor |
| Hands Mill Dam Cumberland County | 10 | — | Significant | Fair |
| Hankins Pond Dam Cumberland County | 9 | — | Significant | Poor |
| Hanks Pond Dam Passaic County | 14 | 1900 | Significant | Fair |
| Hanover Lake Dam Burlington County | 9 | 1948 | Significant | Not Available |
| Harrison Mountain Lake Dam Passaic County | 15 | 1930 | Low | Not Rated |
| Harrisonville Dam Gloucester County | 15 | — | Significant | Poor |
| Harrisville Dam Burlington County | 13 | 1932 | Significant | Poor |
| Hawthorne Lake Dam Sussex County | 8 | 1900 | Low | Satisfactory |
| Heaters Pond Dam Sussex County | 8 | 1910 | High | Satisfactory |
| Helmetta Dam Middlesex County | 7 | — | Significant | Satisfactory |
| Hemlock Lake Dam Sussex County | 20 | 1951 | Significant | Poor |
| Hemlock Pond Dam Sussex County | 15 | — | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.