New Jersey No Name # 71 Dam Reservoir Report

Last Updated: December 14, 2025

Located in Powerville, Morris County, New Jersey, the New Jersey No Name # 71 Dam is a privately owned structure primarily used for recreation.


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Summary

Built in 1901, this earth dam stands at a height of 12 feet and stretches 165 feet in length. With a storage capacity of 144 acre-feet and a normal storage level of 107 acre-feet, the dam serves as a key feature along the Rockaway River-TR.

Despite being classified as having a low hazard potential and fair condition, the New Jersey No Name # 71 Dam is subject to regular state inspection, enforcement, and permitting by the New Jersey Department of Environmental Protection (NJDEP). The dam's last inspection was conducted in July 2016, with a scheduled inspection frequency of every 4 years. Although no emergency action plan (EAP) is currently in place, the dam's risk assessment and management measures remain unspecified.

Congressional District 11's representative, Mikie Sherrill (D), oversees the area where the dam is situated, ensuring its compliance with state regulations and safety standards. As a focal point for recreational activities, the New Jersey No Name # 71 Dam continues to play a vital role in the local community, providing both leisure opportunities and essential water resource management along the Rockaway River-TR.

Year Completed

1901

Dam Length

165

Dam Height

12

River Or Stream

Rockaway River-TR

Primary Dam Type

Earth

Surface Area

17

Drainage Area

1.7

Nid Storage

144

Hazard Potential

Low

Nid Height

12
       
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.