Lake Monomonac Dam
Massachusetts, Worcester County, North Branch Millers River
Location
| State | Massachusetts |
| County | Worcester |
| River | North Branch Millers River |
| Coordinates | 42.70060, -72.00061 |
Physical Characteristics
| NID Height | 16 ft |
| Dam Height | - |
| Dam Length | 250 ft |
| NID Storage | 4,340 acre-ft |
| Max Storage | 4,340 acre-ft |
| Surface Area | 595 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Fair |
| EAP Status | Yes |
| Last Inspection | October 23, 2025 |
| Inspection Frequency | 2 |
Dam Information
| Year Completed | - |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | Town of Winchendon |
| Other Name | Big Dam;Great Dam;Main 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.