Harrisville Dam Reservoir Report
Nearby: Oswego Dam Batsto Lake Dam
Last Updated: December 13, 2025
Harrisville Dam, located in Bass River Township, New Jersey, is a state-regulated structure built in 1932 primarily for recreational purposes.
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Summary
The earth dam stands at a height of 13 feet and spans 350 feet in length, with a storage capacity of 269 acre-feet and a drainage area of 64 square miles. The dam, situated on the Wading River, plays a crucial role in providing recreational opportunities while also serving as a significant water resource management tool in the region.
Despite its historical significance and recreational value, the dam is currently assessed as being in poor condition with a significant hazard potential. The last inspection in November 2020 highlighted the need for maintenance and potential safety concerns, indicating the importance of ongoing monitoring and potential risk management measures. With a designated inspection frequency of 2 years, it is crucial for authorities to prioritize the upkeep and rehabilitation of Harrisville Dam to ensure the safety of surrounding communities and the preservation of its recreational and water resource functions.
As water resource and climate enthusiasts continue to advocate for sustainable infrastructure and environmental stewardship, the case of Harrisville Dam serves as a reminder of the critical role that dams play in balancing water management needs with recreational activities. With a rich history dating back to the early 20th century, the dam stands as a testament to the intersection of engineering, conservation, and public recreation. Moving forward, proactive maintenance and risk management strategies will be essential to safeguarding the integrity and functionality of Harrisville Dam for future generations to enjoy.
Year Completed |
1932 |
Dam Length |
350 |
Dam Height |
13 |
River Or Stream |
Wading River |
Primary Dam Type |
Earth |
Surface Area |
40 |
Drainage Area |
64 |
Nid Storage |
269 |
Hazard Potential |
Significant |
Nid Height |
13 |
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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