Congdon Pond Dam
Congdon Pond Dam is an earth dam located in New London County, Connecticut, built in 1900. It carries a Significant hazard potential classification and has a poor condition assessment.
About Congdon Pond Dam
The primary purpose of Congdon Pond 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 Congdon Moving & Storage Co. (private). It impounds the Oxoboxo Brook near Uncasville.
The dam stands 35 feet tall and stretches 150 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 135 acre-feet, and collects water from a drainage area of 10 square miles. Completed in 1900, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks.
At 35 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Connecticut |
| County | New London |
| Nearest City | Uncasville |
| River/Stream | Oxoboxo Brook |
| Coordinates | 41.44408, -72.12091 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 150 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 1,845 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Congdon Moving & Storage Co. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00234 |
| Federal ID | CT00234 |
| More Info | State Dam Safety Program |