Poheganut Reservoir Dam
Poheganut Reservoir Dam is an earth dam located in New London County, Connecticut, built in 1952. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Poheganut Reservoir Dam
The primary purpose of Poheganut Reservoir 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 Hatching House Bk near Groton.
The dam stands 16 feet tall and stretches 1,078 feet across, creates a reservoir covering 108 acres, has a maximum storage capacity of 560 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1952, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/28/2023.
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Location
| State | Connecticut |
| County | New London |
| Nearest City | Groton |
| River/Stream | Hatching House Bk |
| Coordinates | 41.36215, -72.03444 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 1,078 ft |
| Year Completed | 1952 (74 years old) |
Storage & Hydraulics
| NID Storage | 687 acre-ft |
| Max Storage | 560 acre-ft |
| Normal Storage | 687 acre-ft |
| Surface Area | 108 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Groton |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/28/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00257 |
| Federal ID | CT00257 |
| More Info | State Dam Safety Program |