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 151–175 of 464
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Greenfield Electric Light & Power Dam Franklin County | 21 | — | Significant | Fair |
| Greenville Pond Dam Worcester County | 22 | 1912 | High | Fair |
| Greenwater Pond Dam Berkshire County | 18 | 1944 | Significant | Fair |
| Greylock Greenhouse Dam Berkshire County | 7 | — | Significant | Fair |
| Grist Mill Pond Dam Middlesex County | 18 | 1800 | Low | Fair |
| Griswold Lower Pond Dam Essex County | 12 | 1983 | Significant | Fair |
| Griswold Pond Dam Essex County | 12 | 1918 | Significant | Fair |
| Hallockville Pond Dam Franklin County | 15 | — | Significant | Fair |
| Hamilton Reservoir Dam Hampden County | 17 | — | High | Fair |
| Hammond Pond Dam Hampshire County | 17 | — | Significant | Fair |
| Harnett Pond Dam Berkshire County | 14 | 1909 | Low | Fair |
| Harris Pond Dam Hampden County | 10 | — | Significant | Fair |
| Hartley Saw Mill Pond Dam Plymouth County | 10 | — | Low | Fair |
| Harvard Pond Dam Worcester County | 8 | — | Significant | Fair |
| Hawes Pond Dam Bristol County | 10 | — | Significant | Fair |
| Hawkes Pond Outlet Dam Essex County | 26 | 1895 | High | Fair |
| Hawley Reservoir Dam Hampshire County | 17 | 1890 | Significant | Fair |
| Hayden Pond Dam Berkshire County | 13 | 1886 | Significant | Fair |
| Hayes Pond Dam Berkshire County | 11 | 1840 | Low | Fair |
| Haynes Reservoir Dam Worcester County | 15 | — | Significant | Fair |
| Hill Reservoir Dam Hampshire County | 41 | 1934 | Significant | Fair |
| Hillside Beach Dam Hampshire County | 21 | — | High | Fair |
| Holden Reservoir Dam No. 1 Worcester County | 47 | 1883 | High | Fair |
| Hollingsworth & Vose Company Dam Middlesex County | 17 | 1900 | Low | Fair |
| Hollingsworth & Vose Dam Norfolk County | 12 | — | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.