Perrineville Dam Reservoir Report

Last Updated: December 8, 2025

Perrineville Dam, located in Millstone Township, New Jersey, serves as a vital recreational area along Rocky Brook, offering a serene escape for water resource and climate enthusiasts.


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Summary

The dam, primarily owned by the local government and regulated by the New Jersey Department of Environmental Protection, stands at a height of 17 feet and spans a length of 450 feet. With a storage capacity of 36 acre-feet and a surface area of 12 acres, the dam provides a picturesque backdrop for outdoor activities.

Despite its scenic beauty, Perrineville Dam poses a significant hazard potential due to its poor condition as assessed in March 2020. The dam is subject to regular inspections every two years to ensure public safety and mitigate risks associated with its deteriorating state. With its emergency action plan last revised in July 2021, efforts are being made to address the dam's deficiencies and enhance its resilience in the face of potential hazards.

As water resource management continues to be a pressing issue in the region, Perrineville Dam stands as a focal point for conservation efforts and risk mitigation strategies. With a heightened focus on dam safety and emergency preparedness, stakeholders are working towards safeguarding this essential water infrastructure while preserving its recreational value for generations to come.

Dam Length

450

Dam Height

17

River Or Stream

Rocky Brook

Primary Dam Type

Earth

Surface Area

12

Drainage Area

2.8

Nid Storage

36

Hazard Potential

Significant

Nid Height

17
       
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.