Haledon Reservoir Dam Reservoir Report

Last Updated: December 7, 2025

The Haledon Reservoir Dam, located in North Haledon, New Jersey, was completed in 1919 and stands at a height of 25 feet with a length of 625 feet.


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Summary

It serves as a critical Earth-type structure on Molly Ann Brook, with a storage capacity of 1280 acre-feet and a maximum discharge of 750 cubic feet per second. The dam's primary purpose is designated as 'Other,' indicating its significance beyond traditional water resource management.

Managed by the local government and regulated by the New Jersey Department of Environmental Protection, the Haledon Reservoir Dam presents a high hazard potential but has been assessed as satisfactory in condition. With a surface area of 75 acres and a drainage area of 1.45 square miles, the dam plays a crucial role in providing water storage and flood control in the region. While its last inspection was conducted in May 2021, regular assessments and emergency preparedness measures are in place to ensure the safety and integrity of the structure.

As a key component of the water infrastructure in Passaic County, the Haledon Reservoir Dam underscores the importance of sustainable water resource management and climate resilience. Its historical significance, coupled with its modern-day regulatory oversight and maintenance practices, exemplifies the critical role that dams play in safeguarding communities and ecosystems against the impacts of extreme weather events and changing climate patterns. The dam's location and design reflect a balance between operational efficiency and environmental stewardship, highlighting the intersection of water resources and climate adaptation in the local context.

Year Completed

1919

Dam Length

625

Dam Height

25

River Or Stream

Molly Ann Brook

Primary Dam Type

Earth

Surface Area

75

Drainage Area

1.45

Nid Storage

1280

Hazard Potential

High

Nid Height

25
       
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.