Treasure Lake Dam Reservoir Report

Last Updated: December 6, 2025

Treasure Lake Dam in Oakland Valley, New York, is a private-owned structure that serves as a recreational spot for water resource and climate enthusiasts.


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Summary

Completed in 1911, this Earth-type dam stands at a height of 7 feet and stretches 100 feet in length, with a storage capacity of 345 acre-feet. Situated along the TR-Neversink River, this dam offers a serene 43-acre surface area for outdoor activities, while also serving as a significant hazard potential due to its uncontrolled spillway and moderate risk assessment.

Managed by the NYS DEC, Treasure Lake Dam is regulated, permitted, inspected, and enforced by state agencies, ensuring its safety and compliance with environmental standards. Despite being not rated in terms of condition assessment, the dam has a regular inspection frequency of 4 times a year, with the latest conducted in June 2019. The emergency action plan (EAP) for the dam was last revised in January 2020, highlighting the importance of preparedness and risk management measures in case of any unforeseen events. Overall, Treasure Lake Dam is a valuable water resource that provides both recreational opportunities and a reminder of the need for careful monitoring and maintenance in the face of changing climate conditions.

Year Completed

1911

Dam Length

100

Dam Height

7

River Or Stream

TR-NEVERSINK RIVER

Primary Dam Type

Earth

Surface Area

43

Drainage Area

0.29

Nid Storage

345

Hazard Potential

Significant

Nid Height

7
       
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.