Oxycocus East Dike #1 Reservoir Report

Last Updated: December 9, 2025

Oxycocus East Dike #1, located in Ocean County, New Jersey, is a Federal-owned earth dam constructed in 1880 for the primary purpose of serving as a Fish and Wildlife Pond.


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Summary

With a height of 12 feet and a length of 575 feet, the dam has a storage capacity of 144 acre-feet and covers a surface area of 23 acres. The dam is regulated by the New Jersey Department of Environmental Protection (NJDEP) and is under the ownership, design, construction, inspection, and operation of the Fish and Wildlife Service.

Despite being rated as having a low hazard potential, the dam's condition has not been assessed since May 2014. The dam has an uncontrolled spillway with a width of 11 feet and a drainage area of 8.2 square miles. The risk assessment for Oxycocus East Dike #1 indicates a moderate risk level. While the dam currently meets guidelines for emergency action plans, there is no information available on the preparation of inundation maps or the implementation of risk management measures.

Overall, Oxycocus East Dike #1 is a significant structure in the management of water resources and climate in the region, playing a crucial role in supporting fish and wildlife habitats. As a key component of the Philadelphia District of the US Army Corps of Engineers, the dam requires regular inspection and maintenance to ensure its continued safety and effectiveness in flood control and water storage for the surrounding area.

Year Completed

1880

Dam Length

575

Dam Height

12

River Or Stream

Fourmile Branch

Primary Dam Type

Earth

Surface Area

23

Hydraulic Height

12

Drainage Area

8.2

Nid Storage

144

Structural Height

12

Hazard Potential

Low

Foundations

Soil

Nid Height

12
       
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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.