Hopkins Lake Dam Reservoir Report

Last Updated: December 5, 2025

Hopkins Lake Dam, located in Haddonfield, New Jersey, along the Cooper River, is a significant earth dam standing at a height of 25 feet with a length of 210 feet.


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Summary

The dam primarily serves a recreational purpose, offering a serene environment for water resource and climate enthusiasts to enjoy. With a storage capacity of 24 acre-feet and a maximum discharge of 650 cubic feet per second, the dam plays a crucial role in regulating the flow of water in the area.

Despite its importance, the dam's condition assessment is rated as poor, indicating a need for maintenance and potential safety concerns. The hazard potential is classified as significant, highlighting the urgency of addressing any potential risks associated with the dam. The last inspection took place in July 2020, with an inspection frequency of every 2 years, pointing to the importance of regular monitoring and upkeep to ensure the safety and functionality of the structure.

As a focal point for recreation in the region, Hopkins Lake Dam stands as a vital water resource management infrastructure. With its location in Camden County, New Jersey, the dam serves as a reminder of the delicate balance between water conservation, climate considerations, and the need for regular maintenance to ensure the safety and well-being of the surrounding community.

Dam Length

210

Dam Height

25

River Or Stream

Cooper River

Primary Dam Type

Earth

Surface Area

4

Drainage Area

0.5

Nid Storage

24

Hazard Potential

Significant

Nid Height

25
       
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.