Lake Marie Dam
Lake Marie Dam is an earth dam located in Windham County, Connecticut, built in 1880. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Lake Marie Dam
The primary purpose of Lake Marie Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Joshua's Tract Conservation & Historic Trust (private). It impounds the Ballymahack Brook near Windham.
The dam stands 9 feet tall and stretches 160 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 73 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1880, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 04/15/2022.
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Location
| State | Connecticut |
| County | Windham |
| Nearest City | Windham |
| River/Stream | Ballymahack Brook |
| Coordinates | 41.70763, -72.13831 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 160 ft |
| Year Completed | 1880 (146 years old) |
Storage & Hydraulics
| NID Storage | 73 acre-ft |
| Max Storage | 73 acre-ft |
| Normal Storage | 73 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 31 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Joshua's Tract Conservation & Historic Trust |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/15/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00196 |
| Federal ID | CT00196 |
| More Info | State Dam Safety Program |