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 501–525 of 830
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Johnson Lake Dam Sussex County | 11 | — | Low | Satisfactory |
| John'S Lake Dam Sussex County | 11 | — | Low | Satisfactory |
| Jefferson Lake Dike Sussex County | 14 | — | Low | Not Rated |
| Jefferson Lake Dam Sussex County | 15 | — | Low | Poor |
| Jcc Dam Burlington County | 11 | — | Significant | Satisfactory |
| Jaqui Mill Dam Morris County | 27 | 1920 | High | Poor |
| Jacksons Mills Dam Ocean County | 15 | 1925 | Significant | Satisfactory |
| Jackson Pond Dam Union County | 15 | — | Significant | Satisfactory |
| Island Farm Weir Dam Somerset County | 8 | — | Low | Satisfactory |
| Irish Brook Dam Passaic County | 17 | 1923 | High | Satisfactory |
| Iona Lake Dam Gloucester County | 11 | — | Significant | Poor |
| Indian Mills Dam Burlington County | 11 | 1807 | Significant | Fair |
| Indian Lake Dam Morris County | 19 | 1921 | Low | Satisfactory |
| Indian Dam Monmouth County | 17 | 1937 | Significant | Poor |
| Imlaystown Lake Dam Monmouth County | 20 | 1925 | Significant | Poor |
| Hurley Pond Dam Monmouth County | 6 | 1915 | Significant | Poor |
| Hunterdon Learning Center Dam Hunterdon County | 35 | 1971 | Low | Not Rated |
| Hopkins Lake Dam Camden County | 25 | — | Significant | Poor |
| Holstein Lake Dam Morris County | 15 | 1875 | Low | Not Rated |
| Holiday Lake Dam Ocean County | 16 | 1965 | Low | Fair |
| Hobb Lake Dam Camden County | 12 | 1828 | Significant | Poor |
| Hoaglan Farms West Dam Somerset County | 12 | 1988 | Significant | Satisfactory |
| Hipps Folley Dam Burlington County | 15 | 1967 | Low | Not Available |
| Highland Lakes Dam Sussex County | 22 | 1937 | High | Satisfactory |
| Highland Lake Dam Passaic County | 40 | 1947 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.