Indian Mills Dam Reservoir Report

Last Updated: December 13, 2025

Indian Mills Dam, located in Shamong Township, New Jersey, is a significant earth dam completed in 1807 for recreational purposes.


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Summary

Situated on Muskingum Brook, the dam stands at a height of 11 feet and has a length of 600 feet, providing a storage capacity of 267 acre-feet. With a normal storage capacity of 160 acre-feet and a surface area of 40 acres, the dam plays a crucial role in the local ecosystem and water supply management.

Managed by the local government and regulated by the New Jersey Department of Environmental Protection, Indian Mills Dam has a satisfactory condition assessment and a significant hazard potential. The dam underwent its last inspection in September 2021, with a frequency of every 2 years. Despite its age, the dam continues to serve its recreational purpose while ensuring the safety and well-being of the surrounding communities. The dam's emergency action plan is regularly updated to meet guidelines and ensure preparedness in case of any unforeseen events.

Furthermore, Indian Mills Dam is located in Congressional District 03, New Jersey, represented by Andy Kim (D). The dam's maximum discharge capacity is 487 cubic feet per second, highlighting its importance in managing water flow and preventing flooding in the area. As a vital infrastructure asset, the dam's role in water resource management and climate resilience underscores the need for continued monitoring, maintenance, and risk assessment to safeguard the community and the environment.

Year Completed

1807

Dam Length

600

Dam Height

11

River Or Stream

Muskingum Brook

Primary Dam Type

Earth

Surface Area

40

Drainage Area

5.8

Nid Storage

267

Hazard Potential

Significant

Nid Height

11
       
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.