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 751–775 of 1,291
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Morey'S Bridge Dam Bristol County | 13 | 1832 | High | Satisfactory |
| Morley Swamp Dam Berkshire County | 9 | 1948 | Low | 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 |
| Morse Reservoir Dam Worcester County | 25 | — | Significant | Satisfactory |
| Morses Pond Dam Norfolk County | 12 | — | Significant | Satisfactory |
| Mossy Pond Dam Worcester County | 18 | 1876 | Significant | Poor |
| Mossy Pond Dike Worcester County | 10 | 1847 | Significant | Poor |
| Mother Brook Diversion At Charles River Norfolk County | 16 | 1959 | Significant | Satisfactory |
| Moulton Pond Dam Worcester County | 16 | — | High | Unsatisfactory |
| Mountain Lake Dam Hampden County | 32 | 1923 | High | Satisfactory |
| Mountain Street Reservoir Dam Hampshire County | 33 | 1902 | High | Fair |
| Mountain Street Reservoir Dikes Hampshire County | 30 | 1905 | Low | Poor |
| Mount Holyoke College Lower Pond Dam Hampshire County | 24 | 1936 | High | Fair |
| Mount Holyoke College Upper Pond Dam Hampshire County | 20 | — | High | Fair |
| Mount Pleasant Pond Dam Worcester County | 13 | 1967 | Significant | Fair |
| Mount Wayte Outlet Works Middlesex County | 7 | — | Low | Poor |
| Mount Williams Reservoir Dam & Dike Berkshire County | 40 | 1914 | High | Poor |
| Muddy Cove Pond Dam Bristol County | 32 | 1950 | High | Fair |
| Muddy Pond Dam Plymouth County | 8 | 1900 | Low | Satisfactory |
| Murray Printing Company Dam Middlesex County | 9 | 1910 | Significant | Satisfactory |
| Musketaquid Pond Upper Dam Middlesex County | 8 | 1900 | Low | Satisfactory |
| Muzzy Meadow Dam Worcester County | 13 | — | High | Satisfactory |
| Nabnasset Pond Dam Middlesex County | 14 | 1926 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.