New Jersey No Name # 101 Dam Reservoir Report

Last Updated: December 8, 2025

New Jersey No Name # 101 Dam, located in Manchester Township, New Jersey, is a state-regulated earth dam on the North Branch Rancocas Creek with a primary purpose of recreation.


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Summary

Standing at a height of 8 feet and spanning a length of 2850 feet, this dam provides a storage capacity of 550 acre-feet and covers a surface area of 60 acres. With a drainage area of 2.1 square miles, the dam poses a low hazard potential but has been assessed as unsatisfactory in condition as of November 2018.

Despite its low hazard potential, the New Jersey No Name # 101 Dam requires regular inspections, with the last one conducted in November 2018 and a frequency of every 4 years. The dam is under the jurisdiction of the New Jersey Department of Environmental Protection (NJDEP) and is owned by the state. While the dam is primarily used for recreational purposes, its condition assessment raises concerns about its long-term safety and maintenance requirements. Water resource and climate enthusiasts may find this dam's data intriguing for its potential environmental impact and the need for ongoing monitoring and management to ensure public safety and water conservation efforts in the area.

Dam Length

2850

Dam Height

8

River Or Stream

North Branch Rancocas Creek

Primary Dam Type

Earth

Surface Area

60

Drainage Area

2.1

Nid Storage

550

Hazard Potential

Low

Nid Height

8
       
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.