Hempstead Lake Dam
New York — Nassau County — MILL RIVER
Location
| State | New York |
| County | Nassau |
| River | MILL RIVER |
| Coordinates | 40.67306, -73.64778 |
Physical Characteristics
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 1,200 ft |
| NID Storage | 1,220 acre-ft |
| Max Storage | 1,220 acre-ft |
| Surface Area | 149 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Satisfactory |
| EAP Status | Yes |
| Last Inspection | November 22, 2024 |
| Inspection Frequency | 2 |
Dam Information
| Year Completed | 1873 |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | State |
| Owner | NYS OFFICE OF PARKS, RECREATION & HISTORIC PRESERVATION- LONG ISLAND REGION |
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.