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 551–575 of 830
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Griffith Dam Morris County | 9 | — | Low | Not Rated |
| Grenloch Lake Dam Gloucester County | 21 | 1907 | Significant | Fair |
| Greenwood Lake Dam Passaic County | 17 | 1928 | High | Poor |
| Green Turtle Pond Dam Passaic County | 35 | — | High | Fair |
| Green Swamp #4 Dam Passaic County | 65 | 1925 | High | Satisfactory |
| Green Swamp #3 Dam Passaic County | 18 | 1926 | High | Satisfactory |
| Green Swamp #2 Dam Passaic County | 65 | 1925 | High | Satisfactory |
| Green Swamp #1 Dam Passaic County | 29 | 1926 | High | Satisfactory |
| Green Street Dam Middlesex County | 8 | 1988 | Significant | Satisfactory |
| Green Pond Reservoir Dam Morris County | 15 | — | Low | Not Rated |
| Green Branch Dam Ocean County | 11 | — | Low | Not Rated |
| Great Notch Reservoir Dam Passaic County | 74 | 1898 | High | Satisfactory |
| Great Gorge Dam Sussex County | 28 | 1971 | High | Satisfactory |
| Great Falls Passaic County | 12 | 1840 | Low | Satisfactory |
| Gordon Lakes Dam Passaic County | 12 | — | High | Satisfactory |
| Glen Wild Lake Dam Passaic County | 21 | 1918 | Significant | Fair |
| Glen Lake Dam Sussex County | 12 | 1922 | High | Satisfactory |
| Glen Lake Dam Gloucester County | 25 | 1900 | Low | Not Rated |
| Glendola Reservoir Dam Monmouth County | 65 | 1961 | High | Satisfactory |
| Glauberman Lake Dam Sussex County | 13 | 1933 | Low | Not Rated |
| Gifford'S Mill Dam Ocean County | — | — | Significant | Poor |
| George Lake Dam Morris County | 30 | 1909 | Significant | Poor |
| Gaunts Reservoir Dam Ocean County | 8 | — | Low | Not Rated |
| Gateway Business Park Dam Salem County | 13 | — | Low | Not Rated |
| Gale Dam Burlington County | 15 | 1970 | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.