Stone Mills Dam 2 Reservoir Report

Last Updated: December 18, 2025

Stone Mills Dam 2, also known as Stone Mills Pond, is a state-owned structure located in Limerick, New York.


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Summary

Built in 1989, this earth dam stands at a height of 11 feet and spans a length of 2800 feet, with a storage capacity of 4770 acre-feet. Situated on the Perch River, the dam serves a primary purpose of "Other" and is regulated by the New York State Department of Environmental Conservation.

Despite its low hazard potential, Stone Mills Dam 2 poses a very high risk due to its critical location and the surrounding area's vulnerability to potential flooding. The spillway, with a width of 38 feet, is designed as a controlled outlet for excess water flow. The dam's condition is currently rated as "Not Rated," indicating a need for further assessment and monitoring to ensure its structural integrity and safety.

With a limited history of inspections dating back to July 1996, Stone Mills Dam 2 remains a significant water resource management asset in Jefferson County. As climate change continues to impact water resources and infrastructure, ongoing attention and risk management measures are essential to safeguarding this vital dam and the community it serves.

Year Completed

1989

Dam Length

2800

Dam Height

11

River Or Stream

PERCH RIVER

Primary Dam Type

Earth

Surface Area

210

Drainage Area

10.2

Nid Storage

4770

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.