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 76–100 of 232
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pocahontas Dam Morris County | 11 | 1920 | High | Satisfactory |
| Pleasant Valley Lake Dam Morris County | 35 | 1933 | High | Satisfactory |
| Pleasant Valley Lake Dam Sussex County | 31 | — | High | Poor |
| Pines Lake Dam Passaic County | 42 | 1927 | High | Satisfactory |
| Pinecliff Lake Dam Passaic County | 15 | 1927 | High | Fair |
| Picatinny Lake Morris County | 15 | 1904 | High | Fair |
| Peddie Lake Dam Mercer County | 15 | 1923 | High | Satisfactory |
| Paulinskill Water Shed #2 Dam Sussex County | 29 | 1959 | High | Satisfactory |
| Paulins Kill Site 4 Dam Sussex County | 24 | 1961 | High | Satisfactory |
| Parsippany Dike Morris County | 30 | 1905 | High | Satisfactory |
| Parker Avenue Dam Ocean County | 10 | 1955 | High | Fair |
| Packanack Lake Dam Passaic County | 15 | 1921 | High | Fair |
| Overflow Weir Dam Passaic County | 30 | 1928 | High | Satisfactory |
| Orange Reservoir Dam Essex County | 34 | 1958 | High | Fair |
| Oradell Reservoir Dam Bergen County | 25 | 1922 | High | Fair |
| Oldham Pond Dam Passaic County | 18 | 1849 | High | Satisfactory |
| Oak Ridge Reservoir Dam Passaic County | 60 | 1892 | High | Poor |
| New Street Reservoir Dam Passaic County | 26 | 1925 | High | Fair |
| New Jersey No Name # 40 Dam Passaic County | 15 | — | High | Poor |
| New Jersey No Name #31 Dam Hunterdon County | 23 | — | High | Satisfactory |
| Mount Paul Dam Morris County | 26 | 1918 | High | Satisfactory |
| Mount Hope Lake Dam Morris County | 18 | 1944 | High | Satisfactory |
| Mountain Lake Dam Morris County | 15 | — | High | Satisfactory |
| Mountain Creek Lake Dam Sussex County | 12 | 1984 | High | Poor |
| Morris Lake Dam Sussex County | 19 | 1895 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.