Green Branch Dam Reservoir Report

Last Updated: December 8, 2025

Located in Manchester Township, New Jersey, the Green Branch Dam serves as a vital water supply structure, with a primary purpose of providing water to the surrounding area.


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Summary

This private Earth dam stands at a height of 10.5 feet and has a storage capacity of 210 acre-feet. With a drainage area of 6.2 square miles and a surface area of 30 acres, the dam plays a crucial role in managing water resources in the region.

Owned and regulated by the New Jersey Department of Environmental Protection (NJDEP), the Green Branch Dam is subject to state inspections, permitting, and enforcement to ensure its safety and compliance with regulations. Despite being classified as having a low hazard potential, the dam's condition is not currently rated, highlighting the need for ongoing monitoring and maintenance. While the dam has not been modified in recent years, it is important for water resource and climate enthusiasts to stay informed about the state of infrastructure like the Green Branch Dam to support sustainable water management practices and resilience in the face of changing environmental conditions.

As part of the Philadelphia District of the US Army Corps of Engineers, the Green Branch Dam stands as a testament to the importance of water infrastructure in safeguarding communities and ecosystems. With a focus on water supply and a history dating back to its construction, the dam serves as a key component in the region's water management system. For enthusiasts interested in water resources and climate, understanding the role of structures like the Green Branch Dam is crucial in fostering awareness and advocacy for sustainable water practices and resilience in the face of a changing climate.

Dam Length

3000

Dam Height

10.5

River Or Stream

Wrangle Brook

Primary Dam Type

Earth

Surface Area

30

Drainage Area

6.2

Nid Storage

210

Hazard Potential

Low

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.