Stewart Dam Reservoir Report

Last Updated: December 7, 2025

Stewart Dam is a privately owned structure located in Sussex, New Jersey, along the Black River-TR.


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Summary

Built in 1965, this earth dam stands at 14 feet tall and spans 300 feet in length, with a storage capacity of 200 acre-feet and a normal storage of 150 acre-feet. The dam serves the primary purpose of water supply, providing essential resources to the surrounding area.

The dam is regulated by the New Jersey Department of Environmental Protection (NJDEP) and undergoes regular inspections, with its last assessment in August 2020 rating its condition as fair. With a hazard potential categorized as significant, Stewart Dam plays a crucial role in managing water resources in the region, demonstrating the importance of maintaining its structural integrity. Despite its age, the dam continues to fulfill its purpose effectively, highlighting the significance of ongoing monitoring and maintenance practices.

As a key component of the water supply infrastructure in the area, Stewart Dam plays a vital role in ensuring water availability for the community. With Congressman Josh S. Gottheimer representing the Congressional District 05 of New Jersey, the dam's operations and maintenance contribute to the overall water management efforts in the region. As climate change impacts water resources, Stewart Dam's significance in water supply highlights the need for sustainable management practices and continued regulatory oversight to safeguard its functionality for the future.

Year Completed

1965

Dam Length

300

Dam Height

14

River Or Stream

Black River-TR

Primary Dam Type

Earth

Surface Area

15

Drainage Area

0.31

Nid Storage

200

Hazard Potential

Significant

Nid Height

14
       
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.