Morgan Pond Dam
Morgan Pond Dam is an earth dam located in New London County, Connecticut, built in 1966. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Morgan Pond Dam
The primary purpose of Morgan Pond Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Groton (local government). It impounds the Great Brook near Groton.
The dam stands 45 feet tall and stretches 1,525 feet across, creates a reservoir covering 255 acres, has a maximum storage capacity of 5,355 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1966, the structure is well into its service life at over 50 years 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. The most recent inspection on record was 11/17/2023.
At 45 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Connecticut |
| County | New London |
| Nearest City | Groton |
| River/Stream | Great Brook |
| Coordinates | 41.41100, -72.03299 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 1,525 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 5,355 acre-ft |
| Max Storage | 5,355 acre-ft |
| Normal Storage | 5,355 acre-ft |
| Surface Area | 255 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 3,005 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Groton |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/17/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00528 |
| Federal ID | CT00528 |
| More Info | State Dam Safety Program |