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 651–675 of 1,225
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mansfield Hollow Dam Windham County | 78 | 1952 | High | Not Available |
| Mansfield Recreation Pond Tolland County | 25 | 1974 | Significant | Satisfactory |
| Mansfield Training Dam #1 Tolland County | 10 | 1960 | Significant | Fair |
| Mansfield Training Dam #2 Tolland County | 12 | 1968 | Significant | Fair |
| March Pond Dam Litchfield County | 15 | — | Significant | Fair |
| Margerie Lake Reservoir South Dam Fairfield County | 29 | 1933 | High | Satisfactory |
| Markham Pond Dam Middlesex County | 14 | — | Significant | Satisfactory |
| Mashapaug Pond Dam #3 North Tolland County | 9 | 1900 | Significant | Satisfactory |
| Mason Pond Dam Hartford County | 12 | — | Significant | Satisfactory |
| Mason Pond Dam #1 Hartford County | 15 | — | Significant | Satisfactory |
| Masterbone Pond Dam Litchfield County | 9 | — | Significant | Fair |
| Mathers Pond Dam Fairfield County | 18 | 1921 | Significant | Satisfactory |
| Maupus Pond Dam New Haven County | 18 | 1920 | Significant | Poor |
| Mavis Pond #1 Dam Windham County | 13 | 1870 | Significant | Not Rated |
| May Street Pond North Dam New Haven County | 14 | — | Significant | Satisfactory |
| May Street Pond South Dam New Haven County | 15 | — | Significant | Not Rated |
| Mazzarelli Pond Dam Litchfield County | 11 | — | Significant | Satisfactory |
| Mccoy Pond Dam Litchfield County | 14 | — | Significant | Not Rated |
| Mcgrath Dam New London County | 10 | 1900 | Low | Not Rated |
| Mclaughlin Pond East Dam Tolland County | 11 | 1860 | Significant | Poor |
| Mclaughlin Pond South Dam Tolland County | 5 | — | Significant | Not Rated |
| Mcmanus Lake Dam Fairfield County | 10 | — | Significant | Satisfactory |
| Meadow Brook Detention Hartford County | 11 | — | Significant | Not Rated |
| Meadow Ridge Detention Dam Fairfield County | 6 | — | High | Poor |
| Meadow Ridge Fire Irrigation Pond Dam Fairfield County | 8 | — | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.