Deer Lake Dam
Deer Lake Dam is a masonry dam located in Middlesex County, Connecticut, built in 1920. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Deer Lake Dam
The primary purpose of Deer Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Pathfinders, Inc. (private). It impounds the Chatfield Hollow Brook near Killingly.
The dam stands 12 feet tall and stretches 150 feet across, creates a reservoir covering 45 acres, has a maximum storage capacity of 202 acre-feet, and collects water from a drainage area of 10 square miles. Completed in 1920, 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. The most recent inspection on record was 11/09/2021.
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Location
| State | Connecticut |
| County | Middlesex |
| Nearest City | Killingly |
| River/Stream | Chatfield Hollow Brook |
| Coordinates | 41.34072, -72.58991 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 150 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 202 acre-ft |
| Max Storage | 202 acre-ft |
| Normal Storage | 202 acre-ft |
| Surface Area | 45 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 530 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Pathfinders, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/09/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00404 |
| Federal ID | CT00404 |
| More Info | State Dam Safety Program |