Wonder Lake Dam Reservoir Report

Last Updated: December 5, 2025

Wonder Lake Dam, located in Putnam, New York, along the TR-Muddy Brook, was completed in 1950 and serves as a recreational structure.


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Summary

Standing at 7 feet tall and 50 feet long, this concrete and masonry dam has a storage capacity of 73 acre-feet, with a maximum discharge of 75 cubic feet per second. The dam's spillway, which is uncontrolled, has a width of 25 feet, making it ideal for managing excess water during heavy rainfall events.

Owned by unspecified entities and regulated by the NYS DEC, Wonder Lake Dam has a low hazard potential and a moderate risk assessment rating. Despite not being rated for condition assessment, the dam has been inspected as recently as July 2001. With its primary purpose being recreation, the dam provides a surface area of 26 acres and a normal storage capacity of 62 acre-feet, making it a valuable asset for water resource and climate enthusiasts to explore and appreciate in the beautiful surroundings of Towners, Putnam, New York.

Year Completed

1950

Dam Length

50

Dam Height

7

River Or Stream

TR-MUDDY BROOK

Surface Area

26

Nid Storage

73

Hazard Potential

Low

Nid Height

7
       
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.