Lake Gerard Dike B Reservoir Report
Nearby: Lake Gerard Dam A Lake Gerard Dike C
Last Updated: December 10, 2025
Lake Gerard Dike B, located in Sussex County, New Jersey, is a privately owned earthen dam structure that serves primarily for recreational purposes.
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Summary
Standing at a height of 15 feet and stretching 330 feet in length, the dam has a storage capacity of 1157 acre-feet, with a normal storage level of 960 acre-feet. The dam impounds Franklin Pond Creek, contributing to its surface area of 105 acres and draining an area of 1.9 square miles.
Despite its satisfactory condition assessment as of July 2020, Lake Gerard Dike B poses a high hazard potential, emphasizing the critical need for regular inspections and maintenance. The dam is regulated and permitted by the New Jersey Department of Environmental Protection, with enforcement and inspection responsibilities also falling under state jurisdiction. In case of emergency, however, details regarding an Emergency Action Plan (EAP) and risk management measures are currently not available, highlighting a potential area for improvement in ensuring the safety and resilience of the dam and surrounding areas.
Congressional District 05, New Jersey, represented by Josh S. Gottheimer, oversees Lake Gerard Dike B within Hardyston Township. While the dam has not undergone modifications in recent years, its historical significance and importance for recreational activities underscore the importance of continued monitoring and risk assessment. As climate change impacts water resources and increases the frequency of extreme weather events, the maintenance and safety of structures like Lake Gerard Dike B become even more crucial for the protection of communities and ecosystems in the region.
Dam Length |
330 |
Dam Height |
15 |
River Or Stream |
Franklin Pond Creek |
Primary Dam Type |
Earth |
Surface Area |
105 |
Drainage Area |
1.9 |
Nid Storage |
1157 |
Hazard Potential |
High |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
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