Massachusetts Dams
1,291 dams tracked by the National Inventory of Dams
Total Dams
1,291
High Hazard
319
24.7%
Poor / Unsatisfactory
336
Average Age
112 yrs
Hazard Classification
High319 (24.7%)
Significant616 (47.7%)
Low356 (27.6%)
Condition Assessment
Satisfactory441 (34.2%)
Fair464 (35.9%)
Poor / Unsatisfactory336 (26.0%)
Not Rated50 (3.9%)
Federal
15
State
211
Local
585
Private
451
Tallest Dams
- Cobble Mountain Reservoir Dam245 ft
- Quabbin Winsor Dam170 ft
- Littleville Dam164 ft
- Bear Swamp - North Dike 155 ft
- Knightville Dam150 ft
High Hazard Dams
Poor Condition Dams
All Dams in Massachusetts
Showing 26–50 of 441
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Wellesley Avenue Dam Norfolk County | 11 | — | Low | Satisfactory |
| Wee Laddie Pond Dam Worcester County | 6 | 1974 | Significant | Satisfactory |
| Watershops Pond Dam Hampden County | 33 | 1824 | High | Satisfactory |
| Washington Mountain Lake Dam Berkshire County | 38 | 1972 | High | Satisfactory |
| Warren Upper Reservoir Dam Bristol County | 19 | 1838 | Significant | Satisfactory |
| Warner'S Pond Dam Middlesex County | 9 | 1857 | Significant | Satisfactory |
| Ware Upper Hampshire County | 34 | 1890 | Low | Satisfactory |
| Ware River Diversion Dam Worcester County | 38 | 1910 | Significant | Satisfactory |
| Ware Lower Hampshire County | 18 | 1890 | Low | Satisfactory |
| Wallace Pond Dam Worcester County | 15 | 1950 | Low | Satisfactory |
| Wachusett Reservoir South Dike Worcester County | 45 | 1906 | High | Satisfactory |
| Wachusett Reservoir North Dike Worcester County | 85 | 1904 | High | Satisfactory |
| Wachusett Reservoir Dam Worcester County | 114 | 1906 | High | Satisfactory |
| Waban Hill Reservoir Dam Middlesex County | 24 | 1900 | Low | Satisfactory |
| Valley Pond Dike Middlesex County | 11 | 1961 | Significant | Satisfactory |
| Valley Pond Dam Middlesex County | 14 | 1962 | Significant | Satisfactory |
| Upper Stoneville Reservoir Dam Worcester County | 27 | — | High | Satisfactory |
| Upper Shawme Lake Dam Barnstable County | 12 | — | Significant | Satisfactory |
| Upper Sackett Reservoir Dam Berkshire County | 76 | 1947 | High | Satisfactory |
| Upper Root Reservoir Dam Berkshire County | 36 | 1960 | High | Satisfactory |
| Upper Naukeag Lake Dam Worcester County | 8 | 1875 | Significant | Satisfactory |
| Upper Mystic Lake Dam Middlesex County | 16 | 1860 | Significant | Satisfactory |
| Upper Highland Lake Dike Hampshire County | 15 | 1872 | Significant | Satisfactory |
| Upper Highland Lake Dam Hampshire County | 27 | 1872 | High | Satisfactory |
| Upper Glen Reservoir Dam Franklin County | 59 | 1904 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.