Assunpink #8 Dam Reservoir Report

Last Updated: December 7, 2025

Assunpink #8 Dam, located in Hamilton Township, Mercer County, New Jersey, is a vital structure managed by the local government for water supply purposes.


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Summary

This earth dam, standing at a height of 20 feet and stretching 1450 feet in length, plays a crucial role in regulating the flow of Pond Run. Despite its importance, the dam has been assessed as being in poor condition with a high hazard potential, highlighting the need for urgent maintenance and upgrades to ensure its continued functionality and safety.

Managed by the Natural Resources Conservation Service, Assunpink #8 Dam falls under state jurisdiction and is regulated by the New Jersey Department of Environmental Protection. With a storage capacity of 26 acre-feet and serving a drainage area of 3 square miles, the dam's primary purpose is to provide water supply to the surrounding area. However, its current condition assessment and hazard potential indicate the need for increased attention and resources to address any potential risks or failures that may arise in the future.

As a key infrastructure for water resource management in the region, Assunpink #8 Dam requires regular inspections and maintenance to mitigate the risks associated with its poor condition and high hazard potential. The dam's location in a densely populated area underscores the importance of ensuring its structural integrity and functionality to safeguard the community and surrounding environment from potential disasters. Efforts to improve the dam's condition and enhance its resilience to climate change impacts will be essential in securing a reliable and sustainable water supply for the future.

Dam Length

1450

Dam Height

20

River Or Stream

Pond Run

Primary Dam Type

Earth

Surface Area

13

Drainage Area

3

Nid Storage

26

Hazard Potential

High

Nid Height

20
       
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.