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 26–50 of 332
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Upper East Highland Lake Dam Sussex County | 15 | 1957 | Significant | Satisfactory |
| Upper Crest Lake Dam Passaic County | — | — | Significant | Poor |
| Upper Aetna Lake Dam Burlington County | 14 | 1928 | Significant | Satisfactory |
| Union Mill Lake Dam Burlington County | 13 | — | Significant | Satisfactory |
| Tomlinson Mill Dam Burlington County | 11 | — | Significant | Satisfactory |
| Thundergust Pond Dam Salem County | 13 | — | Significant | Fair |
| Terrace Lake Dam Morris County | 7 | — | Significant | Satisfactory |
| Tarkiln Pond Dam Cape May County | 7 | — | Significant | Satisfactory |
| Tall Pines Farm Dam Sussex County | 23 | 1957 | Significant | Satisfactory |
| Sylva Lake Dam Mercer County | 10 | 1923 | Significant | Fair |
| Suntan Lake Dam Morris County | — | — | Significant | Not Rated |
| Sunshine Lake Dam Camden County | 10 | — | Significant | Satisfactory |
| Sunset Lake Dam Gloucester County | 8 | 1950 | Significant | Satisfactory |
| Sunrise Lake Dam Morris County | 18 | 1930 | Significant | Satisfactory |
| Summit Lake Dam Sussex County | 5 | — | Significant | Satisfactory |
| Stony Brook W.S. Site 11 (Amwell) Dam Hunterdon County | 22 | 1963 | Significant | Poor |
| Stokes-Lower Dam Burlington County | 8 | — | Significant | Poor |
| St. Mary'S Abbey Lower Dam Morris County | 13 | — | Significant | Poor |
| Stiers Pond Dam Warren County | 34 | — | Significant | Poor |
| Stewart Dam Sussex County | 14 | 1965 | Significant | Poor |
| Stephens Lake Dam Passaic County | 12 | — | Significant | Fair |
| Stephen Lake Dam Atlantic County | 9 | — | Significant | Poor |
| Stafford Forge Dam Ocean County | 9 | 1944 | Significant | Fair |
| Spooky Brook Dam Somerset County | 21 | 1971 | Significant | Poor |
| South Barry Lake Dike Sussex County | 6 | — | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.