Connecticut Dams
1,225 dams tracked by the National Inventory of Dams
Total Dams
1,225
High Hazard
236
19.3%
Poor / Unsatisfactory
126
Average Age
115 yrs
Hazard Classification
High236 (19.3%)
Significant936 (76.4%)
Low53 (4.3%)
Condition Assessment
Satisfactory474 (38.7%)
Fair254 (20.7%)
Poor / Unsatisfactory126 (10.3%)
Not Rated371 (30.3%)
Federal
9
State
169
Local
254
Private
697
Tallest Dams
- Colebrook River Dam223 ft
- Mad River Flood Control Dam178 ft
- Nepaug Dam156 ft
- Shepaug 138 ft
- Saville Dam137 ft
High Hazard Dams
- Colebrook River DamHigh
- Mad River Flood Control DamHigh
- Nepaug DamHigh
- Shepaug High
- Saville DamHigh
Poor Condition Dams
All Dams in Connecticut
Showing 426–450 of 936
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mason Pond Dam #1 Hartford County | 15 | — | Significant | Satisfactory |
| Mason Pond Dam Hartford County | 12 | — | Significant | Satisfactory |
| Mashapaug Pond Dam #3 North Tolland County | 9 | 1900 | Significant | Satisfactory |
| Markham Pond Dam Middlesex County | 14 | — | Significant | Satisfactory |
| March Pond Dam Litchfield County | 15 | — | Significant | Fair |
| Mansfield Training Dam #2 Tolland County | 12 | 1968 | Significant | Fair |
| Mansfield Training Dam #1 Tolland County | 10 | 1960 | Significant | Fair |
| Mansfield Recreation Pond Tolland County | 25 | 1974 | Significant | Satisfactory |
| Manitook Lake Dam Hartford County | 12 | — | Significant | Satisfactory |
| Manchester Reservoir #2 Dam Hartford County | 15 | — | Significant | Not Rated |
| Manchester Reservoir #1 Dam Hartford County | 15 | — | Significant | Satisfactory |
| Mamanasco Lake Dam Fairfield County | 6 | 1870 | Significant | Fair |
| Maltby Lake West Dam #3 New Haven County | 29 | 1862 | Significant | Satisfactory |
| Maltby #2 Dam New Haven County | 45 | 1862 | Significant | Satisfactory |
| Malleys Pond Dam New Haven County | 7 | 1925 | Significant | Satisfactory |
| Malcein Pond Dam Hartford County | 10 | — | Significant | Poor |
| Madison Lake Dam New Haven County | 6 | — | Significant | Poor |
| Lydall Pond #1 Dam Hartford County | 12 | 1898 | Significant | Not Rated |
| Lower Unionville Reservoir Dam Hartford County | 16 | — | Significant | Fair |
| Lower Rocky Glen Dam Fairfield County | 18 | 1870 | Significant | Not Rated |
| Lower Pond Dam Hartford County | 5 | — | Significant | Not Rated |
| Lower Pelican Road Pond Dam Tolland County | 4 | — | Significant | Not Rated |
| Lower Murray Pond Dam Middlesex County | 12 | 1924 | Significant | Not Rated |
| Lower Millpond Dam New London County | 14 | — | Significant | Satisfactory |
| Lower Malone Pondpine Street Hartford County | 6 | — | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.