Lower Millpond Dam
Lower Millpond Dam is a masonry dam located in New London County, Connecticut. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Lower Millpond Dam
The primary purpose of Lower Millpond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town Of Old Lyme (local government). It impounds the Mill Brook.
The dam stands 14 feet tall and stretches 160 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 45 acre-feet, and collects water from a drainage area of 8 square miles.
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 10/01/2024.
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Location
| State | Connecticut |
| County | New London |
| River/Stream | Mill Brook |
| Coordinates | 41.33793, -72.32072 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 160 ft |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Normal Storage | 31 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 8 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Old Lyme |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/01/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT01190 |
| Federal ID | CT01190 |
| More Info | State Dam Safety Program |