Triple L Lake Dam Reservoir Report

Last Updated: December 6, 2025

Triple L Lake Dam, located in White Sulphur Springs, Sullivan County, New York, is a private earth dam completed in 1966 with a primary purpose of recreation.


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Summary

The dam stands at 30 feet in height and spans 730 feet in length, with a storage capacity of 74 acre-feet and a surface area of 5 acres. It is regulated by the New York State Department of Environmental Conservation (NYS DEC) and undergoes regular inspections, with the last one conducted in April 2019.

With a significant hazard potential and a moderate risk assessment rating, Triple L Lake Dam plays a crucial role in managing water resources in the region. The dam controls the flow of the TR-SWAN LAKE river or stream and has a maximum discharge capacity of 200 cubic feet per second. Its spillway type is uncontrolled, with a width of 17 feet, and it is equipped with emergency action plans to ensure the safety of surrounding communities in the event of a dam failure. The dam's risk management measures and overall condition assessment have not been rated, indicating the need for continued monitoring and maintenance to safeguard against potential risks.

Triple L Lake Dam serves as a vital infrastructure for recreational activities and water resource management in the area, highlighting the intersection of human development and environmental stewardship. As climate change impacts water availability and quality, the dam's role in regulating water flow and storage becomes increasingly important. By staying compliant with state regulations, conducting regular inspections, and implementing necessary risk management measures, Triple L Lake Dam contributes to the sustainable management of water resources and climate resilience in the region.

Year Completed

1966

Dam Length

730

Dam Height

30

River Or Stream

TR-SWAN LAKE

Primary Dam Type

Earth

Surface Area

5

Drainage Area

1.97

Nid Storage

74

Hazard Potential

Significant

Nid Height

30
       
Seasonal Comparison

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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.