Wilsonville Pond Dam is an earth dam located in Windham County, Connecticut, built in 1880. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 160 ft long. 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 Wilsonville Pond Dam
The primary purpose of Wilsonville Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town of Thompson (local government). It impounds the French River near Thompson.
The dam stands 12 feet tall and stretches 160 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 96 acre-feet, and collects water from a drainage area of 97 square miles. Completed in 1880, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 09/05/2018.
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Location
| State | Connecticut |
| County | Windham |
| Nearest City | Thompson |
| River/Stream | French River |
| Coordinates | 42.01282, -71.88691 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 160 ft |
| Year Completed | 1880 (146 years old) |
Storage & Hydraulics
| NID Storage | 96 acre-ft |
| Max Storage | 96 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 97 sq mi |
| Max Discharge | 3,280 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Thompson |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/05/2018 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT00186 |
| Federal ID | CT00186 |
| More Info | State Dam Safety Program |