Longwood Lake Dam
New Jersey — Morris County — Rockaway River
Location
| State | New Jersey |
| County | Morris |
| River | Rockaway River |
| Coordinates | 40.97790, -74.54662 |
Physical Characteristics
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 91 ft |
| NID Storage | 351 acre-ft |
| Max Storage | 351 acre-ft |
| Surface Area | 43 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Poor |
| EAP Status | Yes |
| Last Inspection | March 21, 2024 |
| Inspection Frequency | 2 |
Dam Information
| Year Completed | 1898 |
| Primary Purpose | Recreation |
| Dam Type | Stone |
| Owner Type | Local Government |
| Owner | Jersey City Municipal Utilities Authority |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.