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 276–300 of 441
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| October Mountain Lake Dam Berkshire County | 39 | 1972 | High | Satisfactory |
| October Mountain Lake Dike Berkshire County | 20 | 1985 | High | Satisfactory |
| Old Grist Mill Pond Dam Bristol County | 12 | 1745 | High | Satisfactory |
| Old Mill Pond Dam Worcester County | 15 | 1800 | Significant | Satisfactory |
| Old Mill Pond Dam Dukes County | 5 | — | Significant | Satisfactory |
| Old Oaken Bucket Pond Dam Plymouth County | 6 | 1640 | Significant | Satisfactory |
| Old Water Supply Dam Middlesex County | 13 | 1900 | Significant | Satisfactory |
| Onota Lake Dam Berkshire County | 18 | 1865 | High | Satisfactory |
| Otis Reservoir Dam Berkshire County | 32 | 1888 | High | Satisfactory |
| Otis Woodlands Club Dam Berkshire County | 22 | — | Significant | Satisfactory |
| Paint Shop Pond Dam Norfolk County | 12 | 2002 | Low | Satisfactory |
| Palmer Brook Dam Berkshire County | 34 | 1968 | High | Satisfactory |
| Palmer Upper Reservoir Dam Hampden County | 25 | 1930 | Significant | Satisfactory |
| Paradise Lake Dam Hampden County | 8 | 1930 | Low | Satisfactory |
| Paradise Pond Dam Hampshire County | 29 | 1850 | High | Satisfactory |
| Partridgeville Pond Dam Worcester County | 20 | 1938 | Significant | Satisfactory |
| Patch Reservoir Dam Worcester County | 8 | 1896 | High | Satisfactory |
| Pentucket Pond Outlet Dam Essex County | 9 | — | Significant | Satisfactory |
| Pepperell Paper Middlesex County | 24 | 1918 | High | Satisfactory |
| Perley Brook Reservoir Dam Worcester County | 50 | 1962 | High | Satisfactory |
| Pine Island Lake Dam Hampshire County | 25 | 1920 | High | Satisfactory |
| Pine Tree Brook Pl-566 Flood Control Dam Norfolk County | 21 | 1955 | Significant | Satisfactory |
| Pleasant Falls Mill Pond Dam Worcester County | 19 | 1895 | Significant | Satisfactory |
| Pontoosuc Lake Dam Berkshire County | 20 | 1866 | High | Satisfactory |
| Powder Mill Worcester County | 10 | 1908 | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.