Amawalk Lake North Dam Reservoir Report

Last Updated: December 5, 2025

Amawalk Lake North Dam, also known as Lake Shenorock Dam, is a privately owned earth dam located in Lincolndale, Westchester County, New York.


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Summary

Built in 1972 for water supply purposes, this dam stands at a height of 11 feet and has a length of 165 feet. It has a storage capacity of 150 acre-feet and covers a surface area of 15 acres, serving the local community with a controlled spillway width of 21 feet.

Despite being categorized as a low hazard potential structure, Amawalk Lake North Dam is deemed to have a very high risk assessment, emphasizing the importance of regular inspections and maintenance. While the last inspection took place in August 2005, the dam's condition is currently listed as "Not Rated." The New York State Department of Environmental Conservation regulates this dam, ensuring compliance with state permitting, inspection, and enforcement requirements to mitigate any potential risks associated with its operation.

Situated on the TR-PLUM BROOK stream, this dam plays a critical role in providing water supply to the area while also being a subject of interest for water resource and climate enthusiasts. With its strategic location and vital function, the Amawalk Lake North Dam stands as a significant infrastructure contributing to the local water management system in New York.

Year Completed

1972

Dam Length

165

Dam Height

11

River Or Stream

TR-PLUM BROOK

Primary Dam Type

Earth

Surface Area

15

Drainage Area

0.8

Nid Storage

150

Hazard Potential

Low

Nid Height

11
       
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.