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 351–375 of 830
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mcafee Glenwood Road Dam No. 1 Sussex County | 8 | 2000 | Significant | Satisfactory |
| Matrix Detention Basin Mercer County | 8 | — | Low | Not Rated |
| Matawan Lake Dam Monmouth County | 20 | 1923 | High | Poor |
| Maskells Mill Pond Dam Salem County | 13 | 1955 | Significant | Poor |
| Mashipacong Pond Dam Sussex County | 12 | — | Low | Not Rated |
| Mary Elmer Lake Dam Cumberland County | 15 | 1924 | Significant | Satisfactory |
| Marlu Lake Dam Monmouth County | 29 | 1965 | Low | Fair |
| Marlton Lakes Upper Dam Burlington County | 12 | 1940 | Significant | Satisfactory |
| Maple Lake Dam Atlantic County | 13 | — | Low | Not Rated |
| Manor Lake Dam Morris County | 5 | — | Significant | Satisfactory |
| Manasquan Reservoir Dam Monmouth County | 53 | 1990 | High | Satisfactory |
| Manalapan Lake Dam Middlesex County | 15 | — | High | Satisfactory |
| Manalapan Brook Pond Dam Monmouth County | 14 | 1924 | Significant | Poor |
| Manahawkin Lake Dam Ocean County | 12 | 1929 | Significant | Poor |
| Malaga Dam Gloucester County | 22 | — | Significant | Fair |
| Make Peace Lake Dam Atlantic County | 13 | — | Low | Not Rated |
| Magnolia Lake Dam Cape May County | 8 | 1684 | Significant | Poor |
| Macopin Reservoir Dam Morris County | 34 | 1892 | High | Poor |
| Ludlam Pond Dam Cape May County | 7 | — | Significant | Poor |
| Lower Twin Lakes Dam Passaic County | 10 | 1927 | Significant | Satisfactory |
| Lower Mount Glen Lake Dam Passaic County | 15 | 1927 | High | Fair |
| Lower Mountain Lake Dam Mercer County | 13 | — | Significant | Satisfactory |
| Lower Crest Lake Dam Passaic County | — | — | Significant | Poor |
| Lower Crandon Lake Dam Sussex County | 8 | — | Low | Poor |
| Lower Aetna Lake Dam Burlington County | 12 | 1926 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.