Great Stone
Massachusetts — Essex County — Merrimack River
Location
| State | Massachusetts |
| County | Essex |
| River | Merrimack River |
| Coordinates | 42.70060, -71.16650 |
Physical Characteristics
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 943 ft |
| NID Storage | 19,900 acre-ft |
| Max Storage | 19,900 acre-ft |
| Surface Area | 655 acres |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Satisfactory |
| EAP Status | Not Required |
| Last Inspection | June 15, 2022 |
| Inspection Frequency | 3 |
Dam Information
| Year Completed | 1848 |
| Primary Purpose | Hydroelectric |
| Dam Type | Masonry |
| Owner Type | Private |
| Owner | Lawrence Hydroelectric Associates |
| Other Name | Lawrence Dam;Merrimack River Dam |
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.