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 426–441 of 441
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Whitehall Reservoir Distribution Dam Middlesex County | 15 | — | Significant | Satisfactory |
| White Pond Dam Worcester County | 14 | 1923 | Low | Satisfactory |
| Whiting Pond Dam Bristol County | 10 | 1959 | High | Satisfactory |
| Whitin Reservoir Dam Worcester County | 33 | 1854 | High | Satisfactory |
| Whitmans Pond Dam Norfolk County | 15 | — | High | Satisfactory |
| Williamstown Reservoir Dam Berkshire County | 32 | 1898 | High | Satisfactory |
| Willow Mill Dam Berkshire County | 24 | 1872 | Significant | Satisfactory |
| Wilson Corne Mill Dam Middlesex County | 12 | 1675 | Significant | Satisfactory |
| Windemere Lake Dam Berkshire County | 34 | 1968 | Low | Satisfactory |
| Windsor Reservoir Dam Berkshire County | 51 | 1865 | High | Satisfactory |
| Winnekenni Basin Dam Essex County | 10 | 1970 | Low | Satisfactory |
| Woods Pond Dam Berkshire County | 18 | 1989 | Significant | Satisfactory |
| Woodwards Mill Dam Middlesex County | 15 | — | Significant | Satisfactory |
| Worcester Diversion Levee System Worcester County | 20 | 1960 | Significant | Satisfactory |
| Woronoco - South Dam Hampden County | 25 | 1938 | Low | Satisfactory |
| Wrights Reservoir Dam Worcester County | 18 | 1965 | High | Satisfactory |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.