Teatown Lake Dam Reservoir Report
Nearby: Vernay Lake Dam Still Lake Dam
Last Updated: December 21, 2025
Teatown Lake Dam, located in Westchester, New York, is a privately owned structure with a significant impact on the surrounding area.
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Summary
Built in 1928, this earth dam stands at a height of 10 feet and stretches 203 feet in length, holding a maximum storage capacity of 160 acre-feet. Situated on the Bailey Brook, the dam is regulated by the New York State Department of Environmental Conservation, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.
Despite its historical significance, Teatown Lake Dam is currently assessed to be in poor condition, with a significant hazard potential and a very high risk level. The last inspection in June 2018 revealed the need for maintenance and improvement to mitigate potential risks and ensure the safety of downstream communities. With a controlled spillway and a storage capacity of 115 acre-feet under normal conditions, the dam plays a crucial role in managing water resources and protecting the surrounding area from floods and other water-related hazards.
As a key structure in the region, Teatown Lake Dam requires immediate attention and risk management measures to address its poor condition and mitigate potential hazards. With the involvement of state regulatory agencies and an emergency action plan in place, efforts are underway to ensure the dam's safety and functionality for the benefit of the community and the environment. For water resource and climate enthusiasts, the preservation and enhancement of Teatown Lake Dam serve as a vital component in safeguarding water resources and adapting to the challenges of a changing climate.
Year Completed |
1928 |
Dam Length |
203 |
Dam Height |
10 |
River Or Stream |
BAILEY BROOK |
Primary Dam Type |
Earth |
Surface Area |
38 |
Drainage Area |
1.37 |
Nid Storage |
160 |
Hazard Potential |
Significant |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
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