Windmill Lake Dam Reservoir Report

Last Updated: December 5, 2025

Windmill Lake Dam, located in North Castle, New York, is a privately owned earth dam completed in 1935 for recreational purposes.


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Summary

With a height of 26 feet and a length of 400 feet, the dam holds a maximum storage capacity of 53 acre-feet and covers a surface area of 13 acres. The dam is regulated by the New York State Department of Environmental Conservation (NYS DEC) and undergoes regular inspections to ensure its safety and structural integrity.

The dam poses a high hazard potential due to its location and the surrounding area's risk of flooding. However, according to the latest assessment in May 2019, the dam's condition was deemed satisfactory. In the event of an emergency, there is no information available regarding the preparation of an Emergency Action Plan (EAP) or whether it meets guidelines. Despite the moderate risk assessment, the dam continues to serve its primary purpose of providing recreational opportunities in the area.

Overall, Windmill Lake Dam stands as a vital structure in Westchester, New York, contributing to water resource management and climate resilience efforts in the region. As a privately owned facility, the dam plays a crucial role in recreational activities while also highlighting the importance of regular inspections and maintenance to ensure public safety and environmental protection.

Year Completed

1935

Dam Length

400

Dam Height

26

River Or Stream

TR-WINDMILL LAKE

Primary Dam Type

Earth

Surface Area

13

Drainage Area

0.03

Nid Storage

53

Hazard Potential

High

Nid Height

26
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.