Lake Kathryn South Dam Reservoir Report

Last Updated: December 13, 2025

Lake Kathryn South Dam, located in Sussex, New Jersey, is a private earth dam primarily used for recreation purposes.


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Summary

With a height of 10 feet and a length of 200 feet, the dam holds a normal storage capacity of 84 acre-feet and covers a surface area of 12 acres. The dam is regulated by the New Jersey Department of Environmental Protection and undergoes regular inspections to ensure its safety and compliance with state regulations.

Despite being classified as low hazard potential, the condition of Lake Kathryn South Dam is currently not rated. The last inspection date was recorded in January 2000, with a scheduled inspection frequency of 4 years. While emergency action plans and risk assessments are not specified in the data, the dam's location in Stillwater Township and its association with a small branch river make it an important water resource for the surrounding area. Additionally, the dam falls under the jurisdiction of Congressional District 05 in New Jersey, represented by Josh S. Gottheimer.

Overall, Lake Kathryn South Dam serves as a vital recreational resource in Sussex County, offering water-based activities and scenic views for visitors and residents alike. As a privately owned structure, the dam plays a crucial role in water management and conservation efforts in the region. With its regulated status and regular inspections, Lake Kathryn South Dam continues to provide a safe and enjoyable environment for water enthusiasts and climate advocates to appreciate and protect.

Dam Length

200

Dam Height

10

River Or Stream

Small Branch

Primary Dam Type

Earth

Surface Area

12

Drainage Area

0.1

Nid Storage

84

Hazard Potential

Low

Nid Height

10
       
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.