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 251–275 of 464
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Lancaster Mill Pond Dam Worcester County | 26 | — | Significant | Fair |
| Lake Wyola Dam Franklin County | 12 | — | High | Fair |
| Lake Williams Dam Middlesex County | 11 | 1882 | High | Fair |
| Lake Watatic Dam Worcester County | 20 | 1955 | High | Fair |
| Lake Wampanoag Dam Worcester County | 22 | — | High | Fair |
| Lake Rico Dam Bristol County | 27 | 1972 | Significant | Fair |
| Lake Pentucket Dam East Essex County | 8 | 1808 | Significant | Fair |
| Lake Monomonac Dam Worcester County | 16 | — | High | Fair |
| Lake Mirimichi Dam Norfolk County | 11 | 1925 | Significant | Fair |
| Lake Maspenock Dam Worcester County | 18 | 1901 | High | Fair |
| Lake Lashaway Dam Worcester County | 23 | 1926 | Significant | Fair |
| Lake George Dam Hampden County | 11 | — | Significant | Fair |
| Lake Ellis Dam Worcester County | 13 | 1852 | Significant | Fair |
| Lake Como Dam Bristol County | 13 | — | Significant | Fair |
| Lake Cochichewick Outlet Dam Essex County | 13 | 1865 | High | Fair |
| Lake Bray Dam Hampden County | 13 | — | Significant | Fair |
| Knights Pond Dam Hampshire County | 19 | 1900 | Significant | Fair |
| Kingsbury Pond Dam Norfolk County | 19 | — | Significant | Fair |
| Kettle Brook Reservoir No. 3 Dam Worcester County | 38 | 1902 | High | Fair |
| Kendall Reservoir Dam Worcester County | 39 | 1911 | High | Fair |
| Kendall Mills Dam Norfolk County | 8 | — | Significant | Fair |
| Juda Dam Hampshire County | 16 | 1962 | Low | Fair |
| Johns Pond Dam Barnstable County | 8 | 2003 | Low | Fair |
| Johnsons Pond Dam Essex County | 9 | 1930 | Significant | Fair |
| Johnson Pond Dam Bristol County | 10 | 1950 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.