Rock Lake Dam is an earth dam located in Fairfield County, Connecticut, built in 1875. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 37 ft37 ft tall and 250 ft long, taller than 83% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Rock Lake Dam
The primary purpose of Rock Lake Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by South Norwalk Electric and Water (public utility). It impounds the Huckleberry Hills Bk near Wilton.
The dam stands 37 feet tall and stretches 250 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 290 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1875, 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. The most recent inspection on record was 07/11/2023.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Connecticut |
| County | Fairfield |
| Nearest City | Wilton |
| River/Stream | Huckleberry Hills Bk |
| Coordinates | 41.18510, -73.45149 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 250 ft |
| Year Completed | 1875 (151 years old) |
Storage & Hydraulics
| NID Storage | 310 acre-ft |
| Max Storage | 290 acre-ft |
| Normal Storage | 310 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 415 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | South Norwalk Electric and Water |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/11/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00216 |
| Federal ID | CT00216 |
| More Info | State Dam Safety Program |