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 526–550 of 1,291
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mount Holyoke College Upper Pond Dam Hampshire County | 20 | — | High | Fair |
| Mount Holyoke College Lower Pond Dam Hampshire County | 24 | 1936 | High | Fair |
| Mountain Street Reservoir Dikes Hampshire County | 30 | 1905 | Low | Poor |
| Mountain Street Reservoir Dam Hampshire County | 33 | 1902 | High | Fair |
| Mountain Lake Dam Hampden County | 32 | 1923 | High | Satisfactory |
| Moulton Pond Dam Worcester County | 16 | — | High | Unsatisfactory |
| Mother Brook Diversion At Charles River Norfolk County | 16 | 1959 | Significant | Satisfactory |
| Mossy Pond Dike Worcester County | 10 | 1847 | Significant | Poor |
| Mossy Pond Dam Worcester County | 18 | 1876 | Significant | Poor |
| Morses Pond Dam Norfolk County | 12 | — | Significant | Satisfactory |
| Morse Reservoir Dam Worcester County | 25 | — | Significant | Satisfactory |
| Morse Pond Dam Worcester County | 9 | — | Low | Poor |
| Morse Pond Dam Bristol County | 9 | 1920 | High | Poor |
| Morse Pond Dam Worcester County | 9 | — | Low | Poor |
| Morley Swamp Dam Berkshire County | 9 | 1948 | Low | Satisfactory |
| Morey'S Bridge Dam Bristol County | 13 | 1832 | High | Satisfactory |
| Moose Hill Reservoir Dam Worcester County | 71 | 1980 | High | Satisfactory |
| Moores Pond Dam Franklin County | 8 | 2010 | Low | Fair |
| Moody Street Dam Middlesex County | 22 | 1847 | High | Fair |
| Monument Pond Dam Bristol County | 10 | — | High | Unsatisfactory |
| Mirror Lake Dike Norfolk County | 11 | — | Significant | Poor |
| Mirror Lake Dam Worcester County | 15 | 1913 | Significant | Satisfactory |
| Mirror Lake Dam Norfolk County | 6 | — | Significant | Fair |
| Minott Pond Dam Worcester County | 7 | — | Significant | Unsatisfactory |
| Millvale Reservoir Dam Essex County | 18 | 1898 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.