| Winsor Dam | |
|---|---|
 Winsor Dam on the Quabbin | |
| Official name | Winsor Dam |
| Location | Ware / Belchertown, Massachusetts, USA |
| Coordinates | 42°16′59″N 72°20′36″W / 42.28306°N 72.34333°W |
| Construction began | 1935 |
| Opening date | 1939 |
| Operator(s) | MWRA |
| Dam and spillways | |
| Impounds | Swift River |
| Height | 295 ft (90 m) |
| Length | 2,640 ft (805 m) |
| Width (base) | 1100 ft (335 m) |
| Reservoir | |
| Creates | Quabbin Reservoir |
The Winsor Dam and the Goodnough Dike impound the waters of the Swift River and the Ware River Diversion forming the Quabbin Reservoir, the largest water body in Massachusetts. According to the Massachusetts Department of Conservation and Recreation the Winsor Dam is one of the largest dams in the Eastern U.S. The Winsor Dam is part of the Chicopee River Watershed. The Winsor Dam was named for Frank E. Winsor, its chief engineer.[1]