Billings Avery Dam
Billings Avery Dam is an earth dam located in New London County, Connecticut, built in 1968. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Billings Avery Dam
The primary purpose of Billings Avery 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 Billings Avery Brook near Ledyard.
The dam stands 19 feet tall and stretches 370 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 54 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1968, 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 11/11/2020.
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Location
| State | Connecticut |
| County | New London |
| Nearest City | Ledyard |
| River/Stream | Billings Avery Brook |
| Coordinates | 41.44816, -72.03873 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 370 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 54 acre-ft |
| Max Storage | 54 acre-ft |
| Normal Storage | 54 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,900 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Groton |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/11/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00563 |
| Federal ID | CT00563 |
| More Info | State Dam Safety Program |