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 501–525 of 1,225
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Isinglass Reservoir Dam Fairfield County | 24 | — | Significant | Fair |
| Island Brook Lagoon Dam Fairfield County | 19 | — | High | Fair |
| Ivoryton Pond Dam Middlesex County | 8 | — | Significant | Satisfactory |
| Ivy Mountain Dam Litchfield County | 20 | — | Low | Fair |
| Jacklin Lake Willis Street Dike Hartford County | 12 | — | Significant | Satisfactory |
| J B Taylor Dam Middlesex County | 13 | — | Significant | Not Rated |
| Jelliff Mill Pond Dam Fairfield County | 14 | — | Significant | Satisfactory |
| Jennings Pond Dam Middlesex County | 22 | 1870 | High | Satisfactory |
| Jepps Brook Pond New Haven County | 10 | — | Significant | Not Rated |
| Jepps Pond Dam New Haven County | 18 | — | Significant | Satisfactory |
| Jeremy Brook Dam New Haven County | 10 | — | Significant | Not Rated |
| Jim'S Dam Litchfield County | 12 | — | Significant | Not Rated |
| John D. Milne Lake Dam Fairfield County | 105 | 1947 | High | Fair |
| Johnson Millpond Dam Middlesex County | 25 | 1880 | Significant | Satisfactory |
| Johnsons Pond Dam Litchfield County | 34 | — | Significant | Not Rated |
| Johns Pond Dam Fairfield County | 8 | — | Significant | Fair |
| Johnstone Pond Dam Windham County | 12 | — | Significant | Satisfactory |
| Jones Pond Dam Litchfield County | 7 | 1938 | Significant | Not Rated |
| Jones Pond Dam Tolland County | 11 | — | Significant | Fair |
| Jones Street Pond Dam Tolland County | 3 | 1973 | Significant | Not Rated |
| Jordan Mill Pond Dam New London County | 7 | 1900 | Low | Not Rated |
| Kasson Road Pond Dam Litchfield County | 8 | — | Significant | Fair |
| Keiser Dam New Haven County | 3 | — | Significant | Not Rated |
| Kelley Pond Dam Litchfield County | 5 | — | Significant | Not Rated |
| Kellogg Pond Dam New Haven County | 7 | — | Significant | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.