Great Stone
Low HazardSatisfactory ConditionEmergency Action Plan: Not Required
Location
| State | Massachusetts |
| County | Essex |
| Nearest City | Lawrence |
| River/Stream | Merrimack River |
| Coordinates | 42.70060, -71.16650 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 943 ft |
| Year Completed | 1848 (178 years old) |
Storage & Hydraulics
| NID Storage | 19,900 acre-ft |
| Max Storage | 19,900 acre-ft |
| Normal Storage | 19,900 acre-ft |
| Surface Area | 655 acres |
| Drainage Area | 4,660 sq mi |
| Max Discharge | 128,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Lawrence Hydroelectric Associates |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/15/2022 |
| Emergency Action Plan | Not Required |