Lisbon Pond Dam Reservoir Report
Last Updated: December 26, 2025
Lisbon Pond Dam, located in Lisbon, Connecticut, was completed in 1959 and serves as a private Earth dam primarily for Fish and Wildlife Pond purposes.
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Summary
The dam stands at a height of 11 feet and has a length of 60 feet, with a total storage capacity of 123 acre-feet and a surface area of 29.1 acres. It is situated on Negro Brook and is regulated by the state agency, DEEP, with regular inspections taking place to ensure its safety and compliance with state regulations.
The dam has a significant hazard potential and falls under the category of "Not Rated" for condition assessment. Although the last inspection was conducted in 1988, the dam is subject to regular monitoring every 7 years. Despite its age, Lisbon Pond Dam continues to play a crucial role in managing water resources and providing a habitat for fish and wildlife in the area. As a key structure in the region, it highlights the importance of proper dam management and maintenance in the face of changing climate conditions and water resource challenges.
Year Completed |
1959 |
Dam Length |
60 |
Dam Height |
11 |
River Or Stream |
NEGRO BROOK |
Primary Dam Type |
Earth |
Surface Area |
29.1 |
Drainage Area |
29.1 |
Nid Storage |
123 |
Hazard Potential |
Significant |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little River Near Hanover
|
38cfs |
Quinebaug River At Jewett City
|
1120cfs |
Shetucket River At Taftville
|
730cfs |
Yantic River At Yantic
|
84cfs |
Shetucket River Near Willimantic
|
615cfs |
Natchaug River At Willimantic
|
288cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Lisbon Pond Dam
Butts Bridge Road Canterbury