Mansfield Hollow Dam
Connecticut — Windham County — NACHAUG RIVER
Location
| State | Connecticut |
| County | Windham |
| River | NACHAUG RIVER |
| Coordinates | 41.75576, -72.18145 |
Physical Characteristics
| NID Height | 78 ft |
| Dam Height | 78 ft |
| Dam Length | 14,050 ft |
| NID Storage | 76,000 acre-ft |
| Max Storage | 76,000 acre-ft |
| Surface Area | 450 acres |
Safety Classification
| Hazard Potential | High |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | June 23, 2025 |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1952 |
| Primary Purpose | Flood Risk Reduction |
| Dam Type | Gravity |
| Owner Type | Federal |
| Owner | USACE - New England District |
| Other Name | Mansfield Hollow Lake |
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.