Lisbon Pond Dam is an earth dam located in Windham County, Connecticut, built in 1959. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 60 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 Lisbon Pond Dam
The primary purpose of Lisbon Pond Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Teixeira, II (private). It impounds the Negro Brook near Lisbon.
The dam stands 11 feet tall and stretches 60 feet across, creates a reservoir covering 29 acres, has a maximum storage capacity of 123 acre-feet, and collects water from a drainage area of 29 square miles. Completed in 1959, the structure is well into its service life at over 50 years 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. The most recent inspection on record was 10/26/1988. That was over 37 years ago.
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Location
| State | Connecticut |
| County | Windham |
| Nearest City | Lisbon |
| River/Stream | Negro Brook |
| Coordinates | 41.64646, -72.01752 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 60 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 123 acre-ft |
| Max Storage | 123 acre-ft |
| Normal Storage | 123 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 29 sq mi |
| Max Discharge | 362 cfs |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Teixeira, II |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/26/1988 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CT01673 |
| Federal ID | CT01673 |
| More Info | State Dam Safety Program |