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 288
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Milford Pond Dam Bristol County | 13 | 1900 | Low | Poor |
| Mill Pond Dam Worcester County | 13 | — | Significant | Poor |
| Mill Pond Dam Barnstable County | 9 | 1930 | Significant | Poor |
| Mill Pond Dam Plymouth County | 17 | 1850 | High | Poor |
| Mirror Lake Dike Norfolk County | 11 | — | Significant | Poor |
| Morse Pond Dam Worcester County | 9 | — | Low | Poor |
| Morse Pond Dam Bristol County | 9 | 1920 | High | Poor |
| Morse Pond Dam Worcester County | 9 | — | Low | Poor |
| Mossy Pond Dam Worcester County | 18 | 1876 | Significant | Poor |
| Mossy Pond Dike Worcester County | 10 | 1847 | Significant | Poor |
| Mountain Street Reservoir Dikes Hampshire County | 30 | 1905 | Low | Poor |
| Mount Wayte Outlet Works Middlesex County | 7 | — | Low | Poor |
| Mount Williams Reservoir Dam & Dike Berkshire County | 40 | 1914 | High | Poor |
| Nelson Mills Pond Dam Franklin County | 27 | 1937 | Significant | Poor |
| 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 |
| Newton Lower Falls Dam Middlesex County | 12 | — | Significant | Poor |
| 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 |
| North Reservoir Dam Middlesex County | 25 | 1874 | High | Poor |
| Notch Reservoir Dam Berkshire County | 64 | 1897 | High | Poor |
| Number One Pond Dam Worcester County | 11 | — | Significant | Poor |
| Nye Pond Dam Barnstable County | 11 | 1669 | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.