Thundergut Pond Dam Reservoir Report

Last Updated: December 5, 2025

Thundergut Pond Dam, located in Alloway Township, Salem, New Jersey, is a state-owned earth dam with a primary purpose of recreation.


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Summary

Completed in 1955, the dam stands at a height of 13 feet and has a length of 380 feet, creating a reservoir with a storage capacity of 125 acre-feet. The dam is situated on Deep Run and is regulated by the New Jersey Department of Environmental Protection, with regular inspections conducted to ensure its safety.

Despite its low hazard potential, Thundergut Pond Dam is assessed to be in poor condition as of August 2019. The dam has a normal storage capacity of 60 acre-feet, covering a surface area of 15 acres. With a drainage area of 0.4 square miles, the dam has a maximum discharge capacity of 140 cubic feet per second. While the dam does not have a spillway or outlet gates, it serves as a vital recreational site in the region, attracting water resource and climate enthusiasts alike.

As climate change impacts water resources, the maintenance and monitoring of dams like Thundergut Pond Dam become increasingly essential. With its historical significance and recreational value, efforts to improve the dam's condition and ensure its long-term stability are crucial for both environmental conservation and public safety in the area.

Year Completed

1955

Dam Length

380

Dam Height

13

River Or Stream

Deep Run

Primary Dam Type

Earth

Surface Area

15

Drainage Area

0.4

Nid Storage

125

Hazard Potential

Low

Nid Height

13
       
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.