Hidden Lake Dam
Hidden Lake Dam is an earth dam located in Middlesex County, Connecticut, built in 1860. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Hidden Lake Dam
The primary purpose of Hidden Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hidden Lake Assocaition (private). It impounds the Unnamed near Haddam.
The dam stands 13 feet tall and stretches 100 feet across, creates a reservoir covering 38 acres, has a maximum storage capacity of 210 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1860, the structure is one of the older dams in the region, with over a century and a half 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 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 11/23/2021.
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Location
| State | Connecticut |
| County | Middlesex |
| Nearest City | Haddam |
| River/Stream | Unnamed |
| Coordinates | 41.41937, -72.57196 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 100 ft |
| Year Completed | 1860 (166 years old) |
Storage & Hydraulics
| NID Storage | 210 acre-ft |
| Max Storage | 210 acre-ft |
| Surface Area | 38 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 207 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Hidden Lake Assocaition |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/23/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00434 |
| Federal ID | CT00434 |
| More Info | State Dam Safety Program |