Robertsville Dam
Robertsville Dam is a concrete dam located in Litchfield County, Connecticut, built in 1887. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Robertsville Dam
The primary purpose of Robertsville Dam is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Firstlight Power Resources (public utility). It impounds the Still River near Colebrook.
The dam stands 29 feet tall and stretches 171 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 134 acre-feet, and collects water from a drainage area of 49 square miles. Completed in 1887, 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 11/19/2021.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Connecticut |
| County | Litchfield |
| Nearest City | Colebrook |
| River/Stream | Still River |
| Coordinates | 41.96603, -73.04377 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 171 ft |
| Year Completed | 1887 (139 years old) |
Storage & Hydraulics
| NID Storage | 134 acre-ft |
| Max Storage | 134 acre-ft |
| Normal Storage | 134 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 49 sq mi |
| Max Discharge | 15,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | FirstLight Power Resources |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/19/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00453 |
| Federal ID | CT00453 |
| More Info | State Dam Safety Program |