Dalrymple Pond Dam Reservoir Report

Last Updated: December 7, 2025

Dalrymple Pond Dam, located in Denville, New Jersey, is a local government-owned structure that serves as a crucial resource for irrigation purposes on the Mill Brook.


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Summary

With a height of 16 feet and a length of 660 feet, this earth dam provides flood risk reduction and irrigation benefits to the surrounding area. The dam has a storage capacity of 73 acre-feet, with a normal storage level of 24 acre-feet, covering a surface area of 7 acres and draining a 0.6 square mile watershed.

This dam, completed in an undisclosed year, is regulated by the New Jersey Department of Environmental Protection (NJDEP), ensuring proper inspection, enforcement, and permitting protocols are followed. Despite its fair condition assessment in 2016, the dam poses a low hazard potential. The last inspection date was in July 2016, with a recommended inspection frequency of every 4 years. With a congressman representing the area in Congressional District 11, New Jersey, Dalrymple Pond Dam remains a vital piece of infrastructure for water resource management and climate resilience in the region.

As climate change continues to impact water resources, Dalrymple Pond Dam plays a crucial role in managing water levels and reducing flood risks in the Morris County area. With its low hazard potential and fair condition assessment, ongoing inspections and maintenance will be essential to ensure the dam's continued effectiveness in providing irrigation and flood risk reduction benefits to the community. As enthusiasts of water resources and climate resilience, it is important to monitor and support the proper management of structures like Dalrymple Pond Dam to safeguard against potential hazards and maintain sustainable water management practices in the region.

Dam Length

660

Dam Height

16

River Or Stream

Mill Brook

Primary Dam Type

Earth

Surface Area

7

Drainage Area

0.6

Nid Storage

73

Hazard Potential

Low

Nid Height

16
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.