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 176–200 of 229
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Powder Mill Pond Dam Somerset County | 9 | — | Significant | Poor |
| Prospertown Dam Ocean County | 19 | 1966 | High | Poor |
| Ramapo Lake Dam Bergen County | 13 | — | High | Poor |
| Rambaut Dam Bergen County | 11 | 1908 | Low | Poor |
| Red Valley Dam Monmouth County | 15 | 1927 | Significant | Poor |
| River Wall Dam Passaic County | 26 | 1961 | High | Poor |
| Rock Island Lake Dam Sussex County | 19 | 1940 | Significant | Poor |
| Rock Ridge Lake Dam Morris County | 10 | 1949 | Significant | Poor |
| Roosevelt Camp Dam Salem County | 15 | 1928 | Significant | Poor |
| Round Valley Dike Hunterdon County | 80 | 1961 | High | Poor |
| Round Valley North Dam Hunterdon County | 135 | 1961 | High | Poor |
| Round Valley South Dam Hunterdon County | 178 | 1961 | High | Poor |
| Saunders Fish Pond Dam Morris County | 12 | — | Significant | Poor |
| Sawmill Pond Dam Sussex County | 15 | — | Low | Poor |
| Saxton Falls Dam Morris County | 16 | 1927 | High | Poor |
| Scenic Lake Dam Sussex County | 35 | — | Low | Poor |
| Shadow Lake Dam Monmouth County | 16 | 1931 | Significant | Poor |
| Silver Lake Dam Sussex County | 11 | — | Low | Poor |
| Silver Lake Dam Cumberland County | 12 | 1936 | Low | Poor |
| Silver Lake Dam Gloucester County | 6 | 1922 | Significant | Poor |
| Skellinger Lake Dam Sussex County | 16 | — | Significant | Poor |
| Skip Morgan Drive Dam Atlantic County | 12 | — | Low | Poor |
| Slabtown Lake Dam Salem County | 10 | 1926 | Low | Poor |
| Spooky Brook Dam Somerset County | 21 | 1971 | Significant | Poor |
| Spruce Run Flow Measuring Weir Dam Hunterdon County | 9 | 1960 | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.