Wampus Lake Reservoir Dam Reservoir Report

Last Updated: December 5, 2025

Wampus Lake Reservoir Dam in Armonk, New York, is a significant earth dam completed in 1940 for recreational purposes.


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Summary

The dam stands at a height of 10 feet and spans a length of 65 feet, with a storage capacity of 180 acre-feet. Located along the Wampus River, the dam has a surface area of 38 acres and a maximum discharge of 68 cubic feet per second, making it a vital water resource and climate feature in Westchester County, New York.

Managed by the local government and regulated by the New York State Department of Environmental Conservation, the Wampus Lake Reservoir Dam has a significant hazard potential and is subject to regular inspections to ensure its structural integrity. While the dam's condition assessment is currently not rated, emergency action plans have been prepared and updated to meet safety guidelines. With a moderate risk assessment level, the dam plays a crucial role in managing water resources and protecting the surrounding area from potential flooding events.

Overall, Wampus Lake Reservoir Dam serves as a key infrastructure for recreation and water management in the region. With its controlled spillway and historical significance, this earth dam continues to be a focal point for water resource enthusiasts and climate advocates interested in the sustainable management of water systems in New York State.

Year Completed

1940

Dam Length

65

Dam Height

10

River Or Stream

WAMPUS RIVER

Primary Dam Type

Earth

Surface Area

38

Nid Storage

180

Hazard Potential

Significant

Nid Height

10
       
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.