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 426–450 of 1,291
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Granite Lake Dam Worcester County | 18 | 1924 | Significant | Satisfactory |
| Granville Reservoir Dam Hampden County | 85 | 1930 | High | Satisfactory |
| Graves Pond Dam Worcester County | 7 | 1970 | Significant | Satisfactory |
| Great Pond Dam Norfolk County | 10 | 1945 | High | Fair |
| Great Pond Upper Reservoir Dam Norfolk County | 18 | 1942 | High | Fair |
| Great River Wall (Grw) Middlesex County | 38 | 1848 | Low | Satisfactory |
| Great Stone Essex County | 38 | 1848 | Low | Satisfactory |
| Greenes Pond Dam Worcester County | 13 | 1925 | Significant | Poor |
| Greenfield Electric Light & Power Dam Franklin County | 21 | — | Significant | Fair |
| Green Hill Pond Dam Worcester County | 25 | 1850 | High | Satisfactory |
| Greenville Pond Dam Worcester County | 22 | 1912 | High | Fair |
| Greenwater Pond Dam Berkshire County | 18 | 1944 | Significant | Fair |
| Greenwood Lake Dam Bristol County | 18 | 1854 | High | Satisfactory |
| Greenwood Pond Dam Worcester County | 8 | — | Significant | Satisfactory |
| Greylock Greenhouse Dam Berkshire County | 7 | — | Significant | Fair |
| Grist Mill Dam Middlesex County | 10 | — | Low | Poor |
| 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 |
| Hackett'S Pond Dam Plymouth County | 12 | — | Significant | Satisfactory |
| Hager Pond Dam Middlesex County | 13 | 1710 | High | Unsatisfactory |
| Hales Pond Dam Norfolk County | 20 | — | Low | Poor |
| Hallockville Pond Dam Franklin County | 15 | — | Significant | Fair |
| Hamilton Reservoir Dam Hampden County | 17 | — | High | Fair |
| Hammershop Pond Dam Norfolk County | 13 | — | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.