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 476–500 of 616
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Silver Lake Dam Worcester County | 16 | 1896 | Significant | Fair |
| Silver Lake Dam Hampden County | 15 | 1878 | Significant | Satisfactory |
| Simonds Pond Dam Worcester County | 32 | — | Significant | Satisfactory |
| Singletary Pond Dam Worcester County | 17 | — | Significant | Fair |
| Slaters Pond Dam Worcester County | 22 | 2004 | Significant | Satisfactory |
| Smith Mill Pond Dam Worcester County | 15 | — | Significant | Fair |
| Smith Pond Dam Berkshire County | 32 | 1961 | Significant | Satisfactory |
| Snake Brook Dam Middlesex County | 25 | 1879 | Significant | Poor |
| Snow Pond Dam Hampshire County | 15 | — | Significant | Fair |
| South Athol Pond Dam Worcester County | 11 | — | Significant | Satisfactory |
| South Barre Mill Pond Worcester County | 22 | 1981 | Significant | Satisfactory |
| Southbridge Reservoir No. 3 Dam Worcester County | 24 | 1894 | Significant | Satisfactory |
| Southbridge Reservoir No. 4 Dam Worcester County | 18 | 1906 | Significant | Satisfactory |
| Southbridge Reservoir No. 5 Dam Worcester County | 38 | 1938 | Significant | Satisfactory |
| South Brook Dam Plymouth County | 9 | — | Significant | Poor |
| South Deerfield Water Supply Dam Franklin County | 30 | — | Significant | Fair |
| South Middleton Dam Essex County | 10 | — | Significant | Poor |
| South Street Pond Dam Plymouth County | 14 | — | Significant | Poor |
| Southwick Lower Pond Dam Worcester County | 11 | — | Significant | Poor |
| Spindleville Pond Dam Worcester County | 12 | — | Significant | Fair |
| Sportsmans Pond Dam Worcester County | 12 | 1898 | Significant | Fair |
| Spot Pond Dam Middlesex County | 18 | 1880 | Significant | Satisfactory |
| Springfield Country Club Dam Hampden County | 15 | 2000 | Significant | Satisfactory |
| Spring Pond Dam Essex County | 8 | 1930 | Significant | Satisfactory |
| Squires Dam Hampden County | 10 | — | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.