Assunpink #19 Dam Reservoir Report

Last Updated: December 8, 2025

Assunpink #19 Dam, located in Monmouth County, New Jersey, is a state-regulated earth dam with a primary purpose of recreation.


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Summary

Standing at a height of 36 feet and stretching 715 feet in length, this dam holds a normal storage capacity of 490 acre-feet of water from the Assunpink Creek. The dam, managed by the Natural Resources Conservation Service, has a significant hazard potential but has been assessed as satisfactory in condition as of July 2021.

With a drainage area of 1.7 square miles and a surface area of 56 acres, Assunpink #19 Dam plays a crucial role in water resource management in the region. The dam has a maximum discharge capacity of 120 cubic feet per second and is inspected every two years to ensure its safety and integrity. Although the dam has not been modified in recent years, it serves as an important recreational site within Upper Freehold Township, providing opportunities for outdoor activities and enjoyment for locals and visitors alike.

As water resource and climate enthusiasts continue to monitor and assess the impact of dams on the environment, Assunpink #19 Dam stands out as a vital structure in the region. With its significant hazard potential and satisfactory condition, this earth dam serves as a key component in the management of water resources and recreational activities along the Assunpink Creek. As efforts continue to ensure the safety and efficiency of the dam, it remains a fundamental feature in the landscape of Monmouth County, New Jersey.

Dam Length

715

Dam Height

36

River Or Stream

Assunpink Creek

Primary Dam Type

Earth

Surface Area

56

Drainage Area

1.7

Nid Storage

490

Hazard Potential

Significant

Nid Height

36
       
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.