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 201–225 of 474
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Millard Pond Dam Fairfield County | 17 | — | Significant | Satisfactory |
| Middle Reservoir Dam New Haven County | 35 | 1890 | Significant | Satisfactory |
| Middle Bolton Lake Dam Tolland County | 20 | 1940 | Significant | Satisfactory |
| Mianus River Dam Fairfield County | 20 | 1920 | Significant | Satisfactory |
| Merry Acres Dam Litchfield County | 10 | 1938 | Significant | Satisfactory |
| Merriman Pond Dam Litchfield County | 16 | 1900 | High | Satisfactory |
| Merimere Reservoir Dam (Dike Is 8030) Hartford County | 33 | 1870 | Significant | Satisfactory |
| Mercers Pond Dam Fairfield County | 20 | 1870 | High | Satisfactory |
| Menunkatuck Reservoir Dam New Haven County | 61 | 1929 | High | Satisfactory |
| Mechanicsville Windham County | 18 | 1900 | Low | Satisfactory |
| Means Brook Reservoir Dam Fairfield County | 54 | 1917 | High | Satisfactory |
| Mcmanus Lake Dam Fairfield County | 10 | — | Significant | Satisfactory |
| Mazzarelli Pond Dam Litchfield County | 11 | — | Significant | Satisfactory |
| May Street Pond North Dam New Haven County | 14 | — | Significant | Satisfactory |
| Mathers Pond Dam Fairfield County | 18 | 1921 | Significant | Satisfactory |
| 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 |
| Margerie Lake Reservoir South Dam Fairfield County | 29 | 1933 | High | Satisfactory |
| Mansfield Recreation Pond Tolland County | 25 | 1974 | Significant | Satisfactory |
| Manitook Lake Dam Hartford County | 12 | — | Significant | Satisfactory |
| Manchester Reservoir #1 Dam Hartford County | 15 | — | Significant | Satisfactory |
| Maltby No. 1 Dam New Haven County | 37 | 1862 | High | Satisfactory |
| Maltby Lake West Dam #3 New Haven County | 29 | 1862 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.