Crescent Lake Dam
Crescent Lake Dam is an earth dam located in Hartford County, Connecticut, built in 1900. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Crescent Lake Dam
The primary purpose of Crescent Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Connecticut Doc (state). It impounds the Freshwater Brook near Thompsonville.
The dam stands 13 feet tall and stretches 600 feet across, creates a reservoir covering 47 acres, has a maximum storage capacity of 335 acre-feet, and collects water from a drainage area of 2 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 04/02/2024.
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Location
| State | Connecticut |
| County | Hartford |
| Nearest City | Thompsonville |
| River/Stream | Freshwater Brook |
| Coordinates | 42.02437, -72.52430 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 600 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 335 acre-ft |
| Max Storage | 335 acre-ft |
| Normal Storage | 210 acre-ft |
| Surface Area | 47 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 725 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut DOC |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/02/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00277 |
| Federal ID | CT00277 |
| More Info | State Dam Safety Program |