Lake Casse Dam Reservoir Report

Last Updated: December 5, 2025

Lake Casse Dam, located in Putnam, New York, is a locally owned structure primarily used for recreational purposes.


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Summary

Built in 1953, this earth-type dam stands at a height of 14 feet and spans a length of 690 feet, impounding a maximum storage capacity of 182 acre-feet. With a normal storage capacity of 80 acre-feet, the dam serves as a vital component of the Croton Falls Reservoir system, contributing to the overall water resource management in the region.

Despite its significant hazard potential and poor condition assessment, Lake Casse Dam remains under the regulatory oversight of the New York State Department of Environmental Conservation. The dam's spillway, which is uncontrolled and 20 feet wide, can accommodate a maximum discharge of 240 cubic feet per second. While the last inspection in April 2019 identified several issues, the dam's emergency action plan is yet to be prepared, raising concerns about its ability to effectively mitigate risks and respond to emergencies in a timely manner.

Given its moderate risk rating and the need for improved maintenance and emergency preparedness measures, Lake Casse Dam serves as a focal point for water resource and climate enthusiasts interested in understanding the challenges and opportunities associated with managing aging infrastructure in the face of evolving environmental conditions. As efforts continue to enhance the dam's resilience and safety, stakeholders are encouraged to stay informed and engaged in supporting sustainable water management practices in the region.

Year Completed

1953

Dam Length

690

Dam Height

14

River Or Stream

TR-CROTON FALLS RESERVOIR

Primary Dam Type

Earth

Surface Area

30

Drainage Area

0.38

Nid Storage

182

Hazard Potential

Significant

Nid Height

14
       
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.