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 776–800 of 1,291
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Nagog Pond Dam Middlesex County | 15 | 1909 | Significant | Satisfactory |
| Natural Bridge Dam Berkshire County | 25 | — | Significant | Satisfactory |
| Naultaug Brook Pond Dam Worcester County | 18 | — | Significant | Fair |
| Nelson Mills Pond Dam Franklin County | 27 | 1937 | Significant | Poor |
| Nemasket Park Dam Plymouth County | 23 | 1964 | Significant | Fair |
| Neponset Reservoir Dam Norfolk County | 10 | 1850 | Significant | Satisfactory |
| Neponset River Dam Norfolk County | 15 | 1850 | Low | Poor |
| Neponset River Dam - Hyde Park Norfolk County | 22 | — | Significant | Poor |
| Neponset River Dam - Lower Mills Suffolk County | 15 | — | Significant | Poor |
| New Bedford Reservoir Dam Bristol County | 10 | 1867 | Significant | Fair |
| New Charles River Dam Suffolk County | 36 | 1978 | Significant | Satisfactory |
| New Home Franklin County | 9 | 1936 | Low | Satisfactory |
| New Pond Dam Worcester County | 18 | — | Significant | Fair |
| New Pond Dam Bristol County | 16 | 1810 | Significant | Fair |
| Newton Lower Falls Dam Middlesex County | 12 | — | Significant | Poor |
| Newton Pond Dam Worcester County | 12 | 1949 | Significant | Satisfactory |
| Newton Reservoir Dam Worcester County | 30 | 1903 | Low | Fair |
| Nichols Road Dam Norfolk County | 10 | — | Significant | Satisfactory |
| Niskayuna Pond Dam Berkshire County | 25 | — | Low | Fair |
| Noanet Pond Dam Norfolk County | 18 | 1963 | Significant | Satisfactory |
| Noquochoke Lake Dam Bristol County | 14 | 1854 | High | Fair |
| Norcross Pond No. 2 Dam Hampden County | 19 | — | Low | Poor |
| Norcross Pond No. 3 Dam Hampden County | 16 | — | Low | Poor |
| Northborough Reservoir Dam Worcester County | 15 | — | Significant | Poor |
| Northfield Mt. - Upper Reservoir Intake Franklin County | 20 | 1973 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.