Gillette Castle Dam is a masonry dam located in Middlesex County, Connecticut. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 4 ft4 ft tall and 22 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Gillette Castle Dam
The primary purpose of Gillette Castle Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Connecticut Deep (state). It impounds the Deep River.
The dam stands 4 feet tall and stretches 22 feet across, creates a reservoir covering 2 acres, and collects water from a drainage area of 0 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 02/03/2023.
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Location
| State | Connecticut |
| County | Middlesex |
| River/Stream | Deep River |
| Coordinates | 41.42419, -72.42633 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 4 ft |
| Dam Height | 4 ft |
| Dam Length | 22 ft |
Storage & Hydraulics
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut Deep |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 02/03/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT01772 |
| Federal ID | CT01772 |
| More Info | State Dam Safety Program |