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 676–700 of 830
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Silver Lake Dam Cumberland County | 12 | 1936 | Low | Poor |
| Sioux Lake Dam Burlington County | 12 | — | Significant | Satisfactory |
| Skellinger Lake Dam Sussex County | 16 | — | Significant | Poor |
| Skip Morgan Drive Dam Atlantic County | 12 | — | Low | Poor |
| Skyline Lake #1 (Lower) Dam Passaic County | 16 | 1947 | High | Satisfactory |
| Skyline Lake #2 (Upper) Dam Passaic County | 24 | 1946 | High | Satisfactory |
| Slabtown Lake Dam Salem County | 10 | 1926 | Low | Poor |
| Sleepy Valley Dam Sussex County | 13 | 1937 | Significant | Satisfactory |
| Smithville Dam Burlington County | 10 | 1935 | High | Satisfactory |
| Smoyer Park Dam Mercer County | 15 | — | Significant | Satisfactory |
| South Barry Lake Dike Sussex County | 6 | — | Significant | Satisfactory |
| Speedwell Dam Morris County | 14 | 1939 | High | Satisfactory |
| Split Rock Pond Dam Morris County | 39 | 1948 | High | Satisfactory |
| Spooky Brook Dam Somerset County | 21 | 1971 | Significant | Poor |
| Spruce Lake Dam Gloucester County | 9 | — | Low | Satisfactory |
| Spruce Run Flow Measuring Weir Dam Hunterdon County | 9 | 1960 | Low | Poor |
| Spruce Run Reservoir Dam Hunterdon County | 93 | 1964 | High | Poor |
| Squibb Dam Mercer County | 26 | — | Low | Satisfactory |
| Stabilization/Leveling Pond Dam Monmouth County | 10 | 1975 | Low | Satisfactory |
| Stafford Forge Dam Ocean County | 9 | 1944 | Significant | Fair |
| Stag Pond Dam Sussex County | 8 | — | Low | Satisfactory |
| Star Lake Upper Dam Passaic County | 11 | 1900 | High | Satisfactory |
| Steenykill Lake Dam Sussex County | 25 | 1938 | High | Fair |
| Stephen Lake Dam Atlantic County | 9 | — | Significant | Poor |
| Stephens Lake Dam Passaic County | 12 | — | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.