Lilly Pond Dam Reservoir Report

Last Updated: December 6, 2025

Lilly Pond Dam, located in Parksville, New York, is a vital water supply structure owned by the local government.


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Summary

Built in 1922, this earth dam stands at 8 feet high and spans 185 feet in length, providing a storage capacity of 210 acre-feet. Situated on the TR-Little Beaver Kill river, the dam serves the primary purpose of water supply for the surrounding area.

Despite being classified with a low hazard potential, Lilly Pond Dam is considered to have a high risk level due to its age and lack of recent condition assessments. The dam has not been rated for its current condition, and the last inspection took place in October 2014. While the dam does not have a spillway, it meets the state regulatory requirements for permitting, inspection, and enforcement, ensuring compliance with safety standards and emergency preparedness.

Water resource and climate enthusiasts are drawn to Lilly Pond Dam for its historical significance, engineering design, and role in providing water supply to the region. With its unique location and connection to the TR-Little Beaver Kill river, this structure remains a key component of the local water infrastructure in Sullivan County, New York. As efforts continue to assess and manage the risks associated with the dam, its importance in maintaining water resources for the community is underscored.

Year Completed

1922

Dam Length

185

Dam Height

8

River Or Stream

TR-LITTLE BEAVER KILL

Primary Dam Type

Earth

Surface Area

78

Nid Storage

210

Hazard Potential

Low

Nid Height

8
       
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.