Cedar Run Dam Reservoir Report

Last Updated: December 9, 2025

Located in Stafford Township, New Jersey, Cedar Run Dam is a Federal-owned structure managed by the Fish and Wildlife Service for the primary purpose of serving as a Fish and Wildlife Pond.


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Summary

Built in 1880, this Earth-type dam stands at a height of 9 feet and stretches 600 feet in length, with a storage capacity of 284 acre-feet.

The dam, situated on the Cedar Run River, has a low hazard potential and is currently in a not rated condition as of its last inspection in May 2014. While it lacks an Emergency Action Plan and updated risk assessment measures, Cedar Run Dam continues to be regulated, inspected, and enforced by the New Jersey Department of Environmental Protection, ensuring its operational safety and compliance with state standards.

Despite its age, Cedar Run Dam remains a vital component of the local ecosystem, providing essential habitat for fish and wildlife. With its moderate risk level and uncontrolled spillway, the dam serves as a key feature in managing water resources and supporting biodiversity in the region, making it a significant structure for water resource and climate enthusiasts to study and appreciate.

Year Completed

1880

Dam Length

600

Dam Height

9

River Or Stream

Cedar Run

Primary Dam Type

Earth

Surface Area

53

Hydraulic Height

9

Drainage Area

6.5

Nid Storage

284

Structural Height

9

Hazard Potential

Low

Foundations

Soil

Nid Height

9
       
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.