Lower Crandon Lake Dam Reservoir Report
Nearby: Crandon Lake Dam Willow Crest Dam
Last Updated: December 13, 2025
Lower Crandon Lake Dam, located in Swartswood, New Jersey, is a local government-owned structure regulated by the NJDEP.
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Summary
This earth-type dam, standing at 8 feet tall and stretching 240 feet in length, serves primarily for recreational purposes, providing a storage capacity of 80 acre-feet for Lower Crandon Lake. The dam, situated on Trout Brook-TR, has a low hazard potential but has been assessed to be in poor condition as of the last inspection in 2008.
Despite its current condition, Lower Crandon Lake Dam continues to be a vital component of the water resource management in the area, with a normal storage capacity of 80 acre-feet and a maximum discharge capability of 420 cubic feet per second. While the dam has not undergone any modifications in recent years, its inspection frequency is set at 4 years, indicating a commitment to ensuring its safety and functionality. The dam's location within Sussex County, New Jersey, showcases its importance in providing recreational opportunities and maintaining the ecological balance of the surrounding area.
Dam Length |
240 |
Dam Height |
8 |
River Or Stream |
Trout Brook-TR |
Primary Dam Type |
Earth |
Surface Area |
20 |
Drainage Area |
3.7 |
Nid Storage |
80 |
Hazard Potential |
Low |
Nid Height |
8 |
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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Lower Crandon Lake Dam