Amawalk Dam Reservoir Report

Last Updated: December 5, 2025

Amawalk Dam, located in Yorktown Heights, New York, stands as a testament to engineering excellence since its completion in 1897.


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Summary

This earth dam serves the primary purpose of water supply, harnessing the waters of the Muscoot River to provide a storage capacity of 23,170 acre-feet. With a height of 85 feet and a length of 1,270 feet, Amawalk Dam not only ensures a reliable water source but also contributes to flood control in the region, boasting a spillway width of 50 feet for uncontrolled releases during high flow events.

Managed by the local government and regulated by the New York State Department of Environmental Conservation, Amawalk Dam has been deemed to have a high hazard potential due to its structural characteristics and proximity to populated areas. However, recent inspections have determined the dam's condition to be satisfactory, with a moderate risk assessment rating of 3. Emergency action plans are in place, though further updates and risk management measures may be necessary to ensure the continued safety and functionality of this vital water resource infrastructure.

Enthusiasts of water resources and climate will appreciate the historical significance and strategic importance of Amawalk Dam in the Westchester County landscape. As a critical component of the region's water supply system, this engineering marvel continues to play a crucial role in water management and environmental stewardship, showcasing the intersection of human ingenuity and natural resources in sustaining communities for over a century.

Year Completed

1897

Dam Length

1270

Dam Height

85

River Or Stream

MUSCOOT RIVER

Primary Dam Type

Earth

Surface Area

606

Drainage Area

19.5

Nid Storage

23170

Hazard Potential

High

Nid Height

85
       
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.