Blue Lake Dam is an earth dam located in New London County, Connecticut, built in 1900. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 135 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Blue Lake Dam
The primary purpose of Blue Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Blue Lake, LLC. (private). It impounds the Ashwillet Brook near North Stonington.
The dam stands 10 feet tall and stretches 135 feet across, creates a reservoir covering 54 acres, has a maximum storage capacity of 243 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1900, 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 08/16/2024.
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Location
| State | Connecticut |
| County | New London |
| Nearest City | North Stonington |
| River/Stream | Ashwillet Brook |
| Coordinates | 41.51081, -71.89148 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 135 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 243 acre-ft |
| Max Storage | 243 acre-ft |
| Normal Storage | 243 acre-ft |
| Surface Area | 54 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 146 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Blue Lake, LLC. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/16/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00574 |
| Federal ID | CT00574 |
| More Info | State Dam Safety Program |