Lake Heloise Dam Reservoir Report
Last Updated: December 7, 2025
Lake Heloise Dam, located in Windham, New York, stands as a beacon for water resource and climate enthusiasts.
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Summary
Built in 1910, this private-owned earth dam serves primarily for recreation purposes and holds a normal storage capacity of 120 acre-feet. With a dam height of 20 feet and a length of 510 feet, the structure overlooks the TR-BATAVIA KILL river, offering a serene backdrop for outdoor activities.
Despite being classified with a low hazard potential, Lake Heloise Dam has a moderate risk assessment due to its age and lack of recent condition assessment. The dam's spillway, with a width of 25 feet, is uncontrolled, adding a touch of natural beauty to the landscape. The area boasts a surface area of 25 acres and a maximum discharge capacity of 1000 cubic feet per second, providing ample opportunities for water-based recreation.
Although not under the jurisdiction of the US Army Corps of Engineers, Lake Heloise Dam is regulated, permitted, inspected, and enforced by the NYS DEC. The dam's association with the Batavia Kill river, along with its historical significance and recreational value, make it a vital component of the water infrastructure in Greene County, New York. Enthusiasts of water resources and climate alike can appreciate the beauty and functionality of Lake Heloise Dam as it continues to play a crucial role in the local ecosystem.
Year Completed |
1910 |
Dam Length |
510 |
Dam Height |
20 |
River Or Stream |
TR-BATAVIA KILL |
Primary Dam Type |
Earth |
Surface Area |
25 |
Drainage Area |
1.25 |
Nid Storage |
160 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Lake Heloise Dam