Lake Frederick Reservoir Report

Last Updated: December 6, 2025

Lake Frederick in Orange County, New York, is a federally owned recreational water body with a rich history dating back to its completion in 1911.


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Summary

Nestled in the Central Valley/Woodbury area, the lake serves as a Fish and Wildlife Pond and a popular spot for outdoor recreation. Managed by the US Army, the dam structure is primarily earth-based with a height of 35 feet and a hydraulic height of 20 feet, providing a maximum storage capacity of 273 acre-feet.

Despite its tranquil appearance, Lake Frederick poses a high hazard potential due to its condition assessment being unavailable, emphasizing the need for regular inspections and risk management measures. With a controlled spillway width of 15 feet and a maximum discharge of 135 cubic feet per second, the lake's risk assessment is classified as very high. Emergency action plans have been prepared and revised in the past, indicating a commitment to ensuring the safety of the surrounding community in case of an unforeseen event.

For water resource and climate enthusiasts, Lake Frederick presents a fascinating case study in dam management and the intersection of recreation and safety. With its unique design features and federal ownership, the lake stands as a testament to the delicate balance between environmental conservation, public enjoyment, and risk mitigation in the face of potential emergencies. As efforts continue to monitor and assess the lake's condition, Lake Frederick remains a valuable resource for wildlife and outdoor enthusiasts alike, showcasing the importance of sustainable water management practices in a changing climate.

Year Completed

1911

Dam Length

580

Dam Height

35

River Or Stream

Woodbury Creek-Tr

Primary Dam Type

Earth

Surface Area

17

Hydraulic Height

20

Nid Storage

273

Structural Height

20

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

35
       
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.