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 232
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Round Valley North Dam Hunterdon County | 135 | 1961 | High | Poor |
| Round Valley South Dam Hunterdon County | 178 | 1961 | High | Poor |
| Sallys Pond Dam Passaic County | 15 | — | High | Fair |
| Saxton Falls Dam Morris County | 16 | 1927 | High | Poor |
| Shackamaxon Dam Union County | 24 | — | High | Fair |
| Shongum Lake Dam Morris County | 12 | 1923 | High | Satisfactory |
| Skyline Lake #1 (Lower) Dam Passaic County | 16 | 1947 | High | Satisfactory |
| Skyline Lake #2 (Upper) Dam Passaic County | 24 | 1946 | High | Satisfactory |
| Smithville Dam Burlington County | 10 | 1935 | High | Satisfactory |
| Speedwell Dam Morris County | 14 | 1939 | High | Satisfactory |
| Split Rock Pond Dam Morris County | 39 | 1948 | High | Satisfactory |
| Spruce Run Reservoir Dam Hunterdon County | 93 | 1964 | High | Poor |
| Star Lake Upper Dam Passaic County | 11 | 1900 | High | Satisfactory |
| Steenykill Lake Dam Sussex County | 25 | 1938 | High | Fair |
| Stony Brook #14 (Honey Lake) Dam Mercer County | 18 | 1964 | High | Satisfactory |
| Stony Brook Water Shed #7 (Hunt Lake) Dam Mercer County | 28 | 1959 | High | Poor |
| Stump Pond Dam Sussex County | 25 | — | High | Poor |
| Sullivan Pond Dam Hunterdon County | 19 | 1959 | High | Fair |
| Sunset Lake Dam Cumberland County | 20 | 1927 | High | Fair |
| Sunset Lake Dam Morris County | 8 | 1914 | High | Poor |
| Swannanoa Lake #1 (South) Dam Morris County | 15 | 1914 | High | Satisfactory |
| Swannanoa Lake #2 (North) Dam Morris County | 11 | 1914 | High | Satisfactory |
| Swimming River Reservoir Dam Monmouth County | 45 | 1901 | High | Satisfactory |
| Sylvan Lake Dam Burlington County | 18 | 1941 | High | Satisfactory |
| Timber Lake Dam Burlington County | 19 | 1955 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.