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 101–125 of 232
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Lake Parsippany East Dike No. 2 Morris County | 5 | 1933 | High | Satisfactory |
| Lake Parsippany West Dike #1 Morris County | 8 | 1933 | High | Satisfactory |
| Lake Rutherford Dam Sussex County | 12 | — | High | Satisfactory |
| Lake Solitude Dam Hunterdon County | 42 | — | High | Satisfactory |
| Lake Tamarack Dam Sussex County | 10 | 1940 | High | Satisfactory |
| Lake Tappan Dam Bergen County | 34 | 1966 | High | Satisfactory |
| Lake Topanemus Dam Monmouth County | 20 | 1915 | High | Fair |
| Lake Tranquility Dam Sussex County | 14 | 1932 | High | Satisfactory |
| Lake Vreeland Dam Bergen County | 20 | 1917 | High | Poor |
| Lake Winona Dam Morris County | 15 | 1950 | High | Poor |
| Lambertville #2 Dam Hunterdon County | 17 | 1877 | High | Satisfactory |
| Lindy'S Lake Dam Passaic County | 24 | — | High | Satisfactory |
| Lionshead Lake Dam Passaic County | 27 | 1939 | High | Poor |
| Locust Lake Dam Warren County | 21 | — | High | Satisfactory |
| Longwood Lake Dam Morris County | 22 | 1898 | High | Poor |
| Lookover Lake Dam Passaic County | 12 | — | High | Satisfactory |
| Lower Mount Glen Lake Dam Passaic County | 15 | 1927 | High | Fair |
| Macopin Reservoir Dam Morris County | 34 | 1892 | High | Poor |
| Manalapan Lake Dam Middlesex County | 15 | — | High | Satisfactory |
| Manasquan Reservoir Dam Monmouth County | 53 | 1990 | High | Satisfactory |
| Matawan Lake Dam Monmouth County | 20 | 1923 | High | Poor |
| Memorial Park Pond Dam Somerset County | 8 | — | High | Poor |
| Merrill Creek Main Dam Warren County | 280 | 1988 | High | Satisfactory |
| Merrill Creek Northwest Dike 1 Warren County | 20 | — | High | Satisfactory |
| Merrill Creek Northwest Dike 2 Warren County | 20 | — | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.