Boulder Lake Dam
Boulder Lake Dam is an earth dam located in Middlesex County, Connecticut, built in 1940. It carries a Significant hazard potential classification and has a fair condition assessment.
About Boulder Lake Dam
The primary purpose of Boulder Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Boulder Lake Improvement Association, Inc. (private). It impounds the Hammonasset R Trib near Clinton.
The dam stands 14 feet tall and stretches 130 feet across, creates a reservoir covering 59 acres, has a maximum storage capacity of 51 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 12/02/2022.
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Location
| State | Connecticut |
| County | Middlesex |
| Nearest City | Clinton |
| River/Stream | Hammonasset R Trib |
| Coordinates | 41.29147, -72.55913 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 130 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 51 acre-ft |
| Max Storage | 51 acre-ft |
| Normal Storage | 51 acre-ft |
| Surface Area | 59 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 66 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Boulder Lake Improvement Association, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 12/02/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00518 |
| Federal ID | CT00518 |
| More Info | State Dam Safety Program |