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 401–425 of 441
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Valley Pond Dam Middlesex County | 14 | 1962 | Significant | Satisfactory |
| Valley Pond Dike Middlesex County | 11 | 1961 | Significant | Satisfactory |
| Waban Hill Reservoir Dam Middlesex County | 24 | 1900 | Low | Satisfactory |
| Wachusett Reservoir Dam Worcester County | 114 | 1906 | High | Satisfactory |
| Wachusett Reservoir North Dike Worcester County | 85 | 1904 | High | Satisfactory |
| Wachusett Reservoir South Dike Worcester County | 45 | 1906 | High | Satisfactory |
| Wallace Pond Dam Worcester County | 15 | 1950 | Low | Satisfactory |
| Ware Lower Hampshire County | 18 | 1890 | Low | Satisfactory |
| Ware River Diversion Dam Worcester County | 38 | 1910 | Significant | Satisfactory |
| Ware Upper Hampshire County | 34 | 1890 | Low | Satisfactory |
| Warner'S Pond Dam Middlesex County | 9 | 1857 | Significant | Satisfactory |
| Warren Upper Reservoir Dam Bristol County | 19 | 1838 | Significant | Satisfactory |
| Washington Mountain Lake Dam Berkshire County | 38 | 1972 | High | Satisfactory |
| Watershops Pond Dam Hampden County | 33 | 1824 | High | Satisfactory |
| Wee Laddie Pond Dam Worcester County | 6 | 1974 | Significant | Satisfactory |
| Wellesley Avenue Dam Norfolk County | 11 | — | Low | Satisfactory |
| Wequaquet Lake Dam Barnstable County | 8 | — | Significant | Satisfactory |
| Westfield Sportsman'S Club Dam Hampden County | 10 | 1955 | Significant | Satisfactory |
| West Lake Dam Berkshire County | 25 | 1967 | High | Satisfactory |
| Weston Reservoir Dam Middlesex County | 45 | — | High | Satisfactory |
| West Springfield Hampden County | 18 | 1840 | Low | Satisfactory |
| West Street Dam Norfolk County | 12 | — | Significant | Satisfactory |
| Weymouth Great Pond Dam Norfolk County | 10 | 1884 | Significant | Satisfactory |
| Wheeler Pond Dam Franklin County | 17 | 1824 | Low | Satisfactory |
| Whitehall Reservoir Dam Middlesex County | 8 | — | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.