Cargill Falls is a concrete dam located in Windham County, Connecticut, built in 1925. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 24 ft24 ft tall and 145 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Cargill Falls
The primary purpose of Cargill Falls 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 Putnam Green Power, LLC (private). It impounds the Quinebaug River near Putnam.
The dam stands 24 feet tall and stretches 145 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 65 acre-feet, and collects water from a drainage area of 289 square miles. Completed in 1925, 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 09/14/2022.
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Location
| State | Connecticut |
| County | Windham |
| Nearest City | Putnam |
| River/Stream | Quinebaug River |
| Coordinates | 41.91570, -71.91110 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 145 ft |
| Year Completed | 1925 (101 years old) |
Storage & Hydraulics
| NID Storage | 65 acre-ft |
| Max Storage | 65 acre-ft |
| Normal Storage | 65 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 289 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Putnam Green Power, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/14/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT01677 |
| Federal ID | CT01677 |
| More Info | State Dam Safety Program |