Five Mile
Five Mile is a masonry dam located in Windham County, Connecticut, built in 1855. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Five Mile
The primary purpose of Five Mile 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 Quinebaug Associates, Llc (private). It impounds the Five Mile River near Killingly.
The dam stands 17 feet tall and stretches 145 feet across, creates a reservoir covering 65 acres, has a maximum storage capacity of 260 acre-feet, and collects water from a drainage area of 77 square miles. Completed in 1855, 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 09/12/2022.
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Location
| State | Connecticut |
| County | Windham |
| Nearest City | Killingly |
| River/Stream | Five Mile River |
| Coordinates | 41.80430, -71.88590 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 145 ft |
| Year Completed | 1855 (171 years old) |
Storage & Hydraulics
| NID Storage | 260 acre-ft |
| Max Storage | 260 acre-ft |
| Normal Storage | 260 acre-ft |
| Surface Area | 65 acres |
| Drainage Area | 77 sq mi |
| Max Discharge | 3,100 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Quinebaug Associates, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/12/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00550 |
| Federal ID | CT00550 |
| More Info | State Dam Safety Program |