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 376–400 of 464
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Squannacook River Dam Middlesex County | 18 | — | High | Fair |
| Squires Dam Hampden County | 10 | — | Significant | Fair |
| Stearns Pond Dam Essex County | 11 | 1930 | Low | Fair |
| Stevens Lake Dam Berkshire County | 9 | — | Significant | Fair |
| Stevens Paper Company Upper Dam Hampden County | 26 | 1901 | Low | Fair |
| Stevens Pond East Dam Essex County | 13 | — | Significant | Fair |
| Stevens Pond Outlet Dam Essex County | 19 | 1877 | High | Fair |
| Stillwater Dam Franklin County | 17 | — | Significant | Fair |
| Stodge Meadow Pond Dam Worcester County | 15 | 1863 | Low | Fair |
| Stony Brook Dam Middlesex County | 24 | 1870 | Significant | Fair |
| Strangman Pond Dam Essex County | 16 | 1884 | High | Fair |
| Stringer Dam Worcester County | 8 | 1900 | Low | Fair |
| Summit Pond Dam Worcester County | 10 | — | Significant | Fair |
| Suntaug Lake Dam Essex County | 17 | 1971 | High | Fair |
| Sutton Falls Dam Worcester County | 18 | 1900 | Significant | Fair |
| Swans Pond Dam Worcester County | 12 | 1848 | Significant | Fair |
| Sylvestri Pond Dam Worcester County | 7 | — | Significant | Fair |
| Talbot Mills Dam Middlesex County | 16 | 1828 | Significant | Fair |
| Thirty Acre Pond Dam Plymouth County | 12 | 1936 | High | Fair |
| Thompson Lake Dam Hampden County | 13 | 1900 | Low | Fair |
| Thousand Acre Lake Dam Berkshire County | 32 | 1960 | High | Fair |
| Thousand Acre Reservoir Dam Worcester County | 27 | 1939 | Low | Fair |
| Threemile Pond Dam Berkshire County | 17 | 1968 | Significant | Fair |
| Three Mile River Dam Bristol County | 13 | — | Significant | Fair |
| Three Mile River No. 1 Dam Bristol County | 13 | — | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.