Guard Lock & Gates
Massachusetts — Middlesex County
Location
| State | Massachusetts |
| County | Middlesex |
| Coordinates | 42.64340, -71.32950 |
Physical Characteristics
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 160 ft |
| NID Storage | 4,500 acre-ft |
| Max Storage | 4,500 acre-ft |
| Surface Area | 720 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Poor |
| EAP Status | — |
| Last Inspection | — |
| Inspection Frequency | 1 |
Dam Information
| Year Completed | 1848 |
| Primary Purpose | Hydroelectric |
| Dam Type | — |
| Owner Type | — |
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.