Cassville Dam Reservoir Report
Last Updated: December 8, 2025
Cassville Dam, located in Jackson Township, New Jersey, is a private Earth dam that serves primarily for recreational purposes.
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Summary
With a height of 6 feet and a length of 225 feet, the dam holds a storage capacity of 100 acre-feet and covers a surface area of 14 acres. Situated on the Small Branch Toms River, the dam is regulated by the New Jersey Department of Environmental Protection and undergoes regular inspections to ensure its satisfactory condition.
The dam, part of the Philadelphia District under Congressional District 04, New Jersey, poses a significant hazard potential due to its size and location. Despite this, the condition assessment conducted in August 2020 deemed the dam to be in satisfactory condition. While there have been no recorded modifications or major incidents at the dam, emergency action plans and risk assessments are yet to be fully developed and implemented. With a maximum discharge capacity of 168 cubic feet per second, the dam plays a crucial role in managing water resources in the area, making it essential for water resource and climate enthusiasts to monitor its maintenance and regulatory compliance closely.
Given its importance for recreation and water management, Cassville Dam stands as a significant structure in Ocean County, New Jersey. With its proximity to the Small Branch Toms River and its role in regulating water flow, the dam serves as a focal point for environmental monitoring and conservation efforts in the region. As climate change continues to impact water resources, the maintenance and management of dams like Cassville will play a vital role in ensuring water security and environmental sustainability for future generations.
Dam Length |
225 |
Dam Height |
6 |
River Or Stream |
Small Branch Toms River |
Primary Dam Type |
Earth |
Surface Area |
14 |
Drainage Area |
6 |
Nid Storage |
100 |
Hazard Potential |
Significant |
Nid Height |
6 |
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.
Cassville Dam
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