| Attribute | Wachusett Reservoir |
| Year Built | 1905 |
| Dam Length | 944 feet |
| Volume Capacity | 65 billion gallons |
| Surface Area | 6.5 square miles |
| Watershed
Area (including reservoir) |
107.69 square miles |
| Shoreline | 37 miles |
| Length | 8.5 miles |
| Maximum Width | 1.1 miles |
| Mean Width | 0.7 miles |
| Maximum Depth | 128 feet |
| Mean Depth | 49 feet |
| Normal Operation Range | 387-392 feet |
| Intake Depth | 364 & 345 feet |
| Overflow Elevation | 395 feet |
| % DCR/DWSP Protected Land | 29% (includes State Park land under a Care & Control Agreement with Office of Watershed Management) |
| % Other Protected Land | 24% |
| Total % Protected Land | 53% |