Mason Farm Pond Dam Reservoir Report

Last Updated: December 8, 2025

Mason Farm Pond Dam, located in Chatham, New York, is a private earth dam completed in 1965 with a primary purpose of recreation.


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Summary

The dam has a height of 15 feet, a length of 383 feet, and a maximum storage capacity of 20 acre-feet. It is situated on the TR-STONY KILL river/stream and is regulated by the NYS DEC, with state permitting, inspection, and enforcement in place.

Despite its recreational benefits, Mason Farm Pond Dam poses a significant hazard potential with a poor condition assessment as of August 2017. The dam has a spillway width of 26 feet and an uncontrolled spillway type, with a maximum discharge capacity of 17 cubic feet per second. The risk assessment for the dam is moderate, with a significant need for risk management measures to address its deficiencies and ensure public safety.

Given its location and condition, Mason Farm Pond Dam warrants ongoing attention and maintenance to mitigate potential risks and ensure its long-term stability. Climate and water resource enthusiasts will find this dam's data intriguing, offering insights into the intersection of human infrastructure, environmental stewardship, and public safety in the context of water management and climate resilience efforts.

Year Completed

1965

Dam Length

383

Dam Height

15

River Or Stream

TR-STONY KILL

Primary Dam Type

Earth

Surface Area

3

Drainage Area

0.16

Nid Storage

20

Hazard Potential

Significant

Nid Height

15
       
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.