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 126–150 of 373
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Great Notch Reservoir Dam Passaic County | 74 | 1898 | High | Satisfactory |
| Green Street Dam Middlesex County | 8 | 1988 | Significant | Satisfactory |
| Green Swamp #1 Dam Passaic County | 29 | 1926 | High | Satisfactory |
| Green Swamp #2 Dam Passaic County | 65 | 1925 | High | Satisfactory |
| Green Swamp #3 Dam Passaic County | 18 | 1926 | High | Satisfactory |
| Green Swamp #4 Dam Passaic County | 65 | 1925 | High | Satisfactory |
| Gropps Lake Dam Mercer County | 25 | 1900 | Low | Satisfactory |
| Hackensack Golf Club Dam Bergen County | 12 | 1950 | Significant | Satisfactory |
| Haledon Reservoir Dam Passaic County | 25 | 1919 | High | Satisfactory |
| 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 |
| Hidden Valley Lake Dam Sussex County | 10 | — | High | Satisfactory |
| Hidden Valley Lake Dam Sussex County | 25 | 1967 | Significant | Satisfactory |
| Highland Lake Dam Passaic County | 40 | 1947 | High | Satisfactory |
| Highland Lakes Dam Sussex County | 22 | 1937 | High | Satisfactory |
| Hoaglan Farms West Dam Somerset County | 12 | 1988 | Significant | Satisfactory |
| Indian Lake Dam Morris County | 19 | 1921 | Low | Satisfactory |
| Irish Brook Dam Passaic County | 17 | 1923 | High | Satisfactory |
| Island Farm Weir Dam Somerset County | 8 | — | Low | Satisfactory |
| Jackson Pond Dam Union County | 15 | — | Significant | Satisfactory |
| Jacksons Mills Dam Ocean County | 15 | 1925 | Significant | Satisfactory |
| Jcc Dam Burlington County | 11 | — | Significant | Satisfactory |
| John'S Lake Dam Sussex County | 11 | — | Low | Satisfactory |
| Johnson Lake Dam Sussex County | 11 | — | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.