Jaqui Mill Dam Reservoir Report
Last Updated: December 13, 2025
Jaqui Mill Dam, located in Morris Plains Borough, New Jersey, serves as a crucial structure for flood risk reduction along the Whippany River.
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Summary
Built in 1920, this Earth type dam stands at a height of 27.4 feet and stretches 250 feet in length, with a storage capacity of 18 acre-feet. Despite its age, the dam is in poor condition, with a high hazard potential, as per the latest inspection conducted in March 2021.
The dam, regulated by the New Jersey Department of Environmental Protection, is owned by the local government and plays a vital role in protecting the surrounding area from potential flooding events. With a drainage area of 7.4 square miles and a surface area of 8 acres, Jaqui Mill Dam is a significant component of the region's water resource management infrastructure. However, its poor condition raises concerns about its ability to effectively mitigate flood risks in the future.
As climate patterns continue to evolve, maintaining and potentially upgrading infrastructure like Jaqui Mill Dam becomes increasingly crucial to ensure the safety and resilience of communities against the impacts of changing weather patterns. With its historical significance and ongoing regulatory oversight, the future of Jaqui Mill Dam will likely involve efforts to improve its condition and enhance its capacity to protect against flooding events in the region.
Year Completed |
1920 |
Dam Length |
250 |
Dam Height |
27.4 |
River Or Stream |
Whippany River |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
7.4 |
Nid Storage |
18 |
Hazard Potential |
High |
Nid Height |
27 |
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.
Jaqui Mill Dam
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