Cedar Grove North Res Dam Reservoir Report

Last Updated: December 11, 2025

Cedar Grove North Reservoir Dam in Little Falls, New Jersey, stands as a critical infrastructure for water supply purposes, with a height of 51 feet and a length of 587 feet.


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Summary

Completed in 1903, the dam boasts a storage capacity of 2,584 acre-feet and serves as a vital component in the region's water resource management. Located offstream, this earth-type dam is regulated by the New Jersey Department of Environmental Protection, ensuring that it meets state inspection and enforcement standards.

Despite its age, Cedar Grove North Reservoir Dam maintains a satisfactory condition assessment, with a high hazard potential due to its critical role in water supply. Regular inspections every two years help ensure the dam's structural integrity, with the last assessment conducted in April 2021. In the event of an emergency, the dam's emergency action plan is in place to mitigate risks and protect surrounding communities. As a key piece of infrastructure in the region, the dam plays a crucial role in safeguarding water resources and managing the area's water supply for the future.

Year Completed

1903

Dam Length

587

Dam Height

51

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

98

Drainage Area

0.45

Nid Storage

2584

Hazard Potential

High

Nid Height

51
       
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.