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 176–200 of 441
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Noanet Pond Dam Norfolk County | 18 | 1963 | Significant | Satisfactory |
| Nichols Road Dam Norfolk County | 10 | — | Significant | Satisfactory |
| Newton Pond Dam Worcester County | 12 | 1949 | Significant | Satisfactory |
| New Home Franklin County | 9 | 1936 | Low | Satisfactory |
| New Charles River Dam Suffolk County | 36 | 1978 | Significant | Satisfactory |
| Neponset Reservoir Dam Norfolk County | 10 | 1850 | Significant | Satisfactory |
| Natural Bridge Dam Berkshire County | 25 | — | Significant | Satisfactory |
| Nagog Pond Dam Middlesex County | 15 | 1909 | Significant | Satisfactory |
| Muzzy Meadow Dam Worcester County | 13 | — | High | Satisfactory |
| Musketaquid Pond Upper Dam Middlesex County | 8 | 1900 | Low | Satisfactory |
| Murray Printing Company Dam Middlesex County | 9 | 1910 | Significant | Satisfactory |
| Muddy Pond Dam Plymouth County | 8 | 1900 | Low | Satisfactory |
| Mountain Lake Dam Hampden County | 32 | 1923 | High | Satisfactory |
| Mother Brook Diversion At Charles River Norfolk County | 16 | 1959 | Significant | Satisfactory |
| Morses Pond Dam Norfolk County | 12 | — | Significant | Satisfactory |
| Morse Reservoir Dam Worcester County | 25 | — | Significant | Satisfactory |
| 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 |
| Mirror Lake Dam Worcester County | 15 | 1913 | Significant | Satisfactory |
| Mill River Dam Hampshire County | 40 | 1939 | Significant | Satisfactory |
| Mill Pond South Dike Middlesex County | 39 | 1973 | High | Satisfactory |
| Mill Pond North Dike Middlesex County | 40 | 1973 | Significant | Satisfactory |
| Mill Pond Dam Berkshire County | 19 | — | Significant | Satisfactory |
| Mill Pond Dam Berkshire County | 11 | 1917 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.