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 326–350 of 616
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Middle Pond Dam No. 3 Bristol County | 10 | 1969 | Significant | Satisfactory |
| Middle Pond Dam No. 4 Bristol County | 16 | — | Significant | Satisfactory |
| Middle Reservoir Dike Middlesex County | 15 | 1891 | Significant | Fair |
| Mill Brook Canal Dam Worcester County | 7 | — | Significant | Fair |
| Millham Reservoir Dam Middlesex County | 26 | 1893 | Significant | Satisfactory |
| Mill Pond Dam Franklin County | 12 | — | Significant | Satisfactory |
| Mill Pond Dam Worcester County | 13 | — | Significant | Poor |
| Mill Pond Dam Bristol County | 10 | — | Significant | Fair |
| Mill Pond Dam Essex County | 10 | — | Significant | Unsatisfactory |
| Mill Pond Dam Barnstable County | 13 | — | Significant | Fair |
| Mill Pond Dam Worcester County | 12 | 1795 | Significant | Fair |
| Mill Pond Dam Barnstable County | 7 | — | Significant | Fair |
| Mill Pond Dam Barnstable County | 9 | 1930 | Significant | Poor |
| Mill Pond Dam Berkshire County | 19 | — | Significant | Satisfactory |
| Mill Pond Dam Essex County | 13 | 2013 | Significant | Satisfactory |
| Mill Pond Dam Berkshire County | 11 | 1917 | Significant | Satisfactory |
| Mill Pond Dam Essex County | 17 | 1875 | Significant | Satisfactory |
| Mill Pond Dam Plymouth County | 10 | — | Significant | Satisfactory |
| Mill Pond No. 1 Dam Worcester County | 19 | 1876 | Significant | Fair |
| Mill Pond North Dike Middlesex County | 40 | 1973 | Significant | Satisfactory |
| Mill River Dam Hampshire County | 40 | 1939 | Significant | Satisfactory |
| Minott Pond Dam Worcester County | 7 | — | Significant | Unsatisfactory |
| Mirror Lake Dam Worcester County | 15 | 1913 | Significant | Satisfactory |
| Mirror Lake Dam Norfolk County | 6 | — | Significant | Fair |
| Mirror Lake Dike Norfolk County | 11 | — | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.