Decozen's Dam Reservoir Report

Last Updated: December 11, 2025

Decozen's Dam, located in Parsippany, New Jersey, was completed in 1954 and serves as a hub for recreational activities in the area.


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Summary

This private dam on Troy Brook stands at a height of 10.9 feet and has a storage capacity of 48 acre-feet, with a normal storage of 38 acre-feet. With its surface area of 10 acres and a drainage area of 0.4 square miles, the dam provides a picturesque setting for outdoor enthusiasts to enjoy.

Managed by the New Jersey Department of Environmental Protection, Decozen's Dam has been deemed to have a significant hazard potential but is currently in satisfactory condition according to the latest assessment in May 2021. The dam undergoes regular inspections every two years to ensure its structural integrity and safety. In case of emergencies, the dam's emergency action plan is continually updated to meet guidelines and ensure the safety of nearby residents and visitors.

As part of Congressional District 11 in New Jersey, Decozen's Dam is a vital recreational resource in the Morris County area. With its earth and rockfill construction, the dam not only offers a peaceful retreat for visitors but also plays a crucial role in water resource management for the region. Whether for hiking, fishing, or simply enjoying the serene surroundings, Decozen's Dam provides a valuable escape for those interested in water resources and climate conservation.

Year Completed

1954

Dam Length

250

Dam Height

10.9

River Or Stream

Troy Brook

Primary Dam Type

Earth

Surface Area

10

Drainage Area

0.4

Nid Storage

48

Hazard Potential

Significant

Nid Height

11
       
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.